Super Tail. Ultra Pro Super N24 Heavy Duty Muncie 4-Speed. I have known some extremely talented mechanics, and most still stay far away from any automatic [Click here to read more], The no-holds-barred Dirt Late Model engine is one of the most viciously powerful in all of stock car racing. I learned from speaking to many builders that the rare 3864848 case seems to be in a few Corvettes and full-size GM cars with big-block engines. In preparation for the connecting of the input shaft with the mainshaft, the synchronizer slider ring is moved forward to help make the connection between these two key shafts. Bumper & Fender Apron Nylon "U" Nut. Again, Thank You for the great customer service. Year Make Model Trim Engine Add vehicle Muncie M-22 Rock Crusher Four Speed Transmission - RARE Drivers Side Speedo Refurbished Sort by. Click . Of these parts, the front shaft bearing and rear seal are usually the first to go. On the right is the M22 countershaft with 27-teeth. These early long tailswere sand-cast. Retaining the 4-speed with your LS swap is a perfect blend of old and new. What you will find in your search for the right Muncie four-speed is conflicting information from different sources. The Muncie four-speed, like the T-10, is a side-loading transmission. This is called a narrow 6307 bearing (PN N307LOE). In this case, the synchronizer requires more persuasion, and a press helps to install this hub assembly. This is the M21 10-spline input shaft with a single groove and the applicable 27/22/19/17-tooth countershaft. On the right is the M22 countershaft with 27-teeth. 11. There also was a second, heavy-duty close-ratio version: the "Rock Crusher" (M22) that. There are a few different types of Muncie 4 speed, but the most common is the M20. Let me explain. If it's original to the car it will have some identifying #s on it . Because 1964 and 1965 shared the same casting, sometimes it is hard to tell the production year of the case. This was eliminated after 1963. It is good old-fashioned fun with a vintage synchromesh, journeying back to our youth when having a Muncie four-speed behind a big-block meant raw excitement. The casting number depends on the date the service case was installed. (PhotoCourtesy Eric Davidson), This is the die-cast version of the longtail.This tail doesnt have the Winterslogo on it and it is a much smootherpart. The T-10 four-speed was an evolution of the T-85 three-speed transmission, with both of these transmissions being quite similar in appearance. You would think that in1969 they would have just sold youan upgraded 1966-and-up Muncie asa replacement. Trans is perfect, and Im so glad I went with this seller. This is a page from an old factory 1967 Nova assembly manual showing threedifferent part numbers for the M20 and one number for the M21. M22 or M22X And finally, if forced to choose between a Muncie or the BorgWarner T-10, it is suggested you choose the Muncie due to its brute strength. For example, the serial number P8A01 is January 1, 1968. One of the most common swaps involves a Muncie 4-speed. Tailshaft housings will vary based on original application. . 11. By the start of 1969 these cases and all future cases had the drain plug boss drilled and threaded. . Here's a typical Muncie gearset consisting of First, Second, and Third gear. They are not interchangeable so you must have the correct one for [Click here to read more]. Remove the side cover and forks for a look at the geartrain. Here's a typical Muncie gearset consisting of First, Second, and Third gear. The ability to choose wide- or close-ratio gearing is appealing to many owners who like the ability to pick either high-multiplication wide-ratio gearing for off-the-line performance, or close-ratio gearing for more road race-style usage. This isbecause material was added aroundthe rear-bearing bore. The m22 was used on the Z28 which was exclusive a small block . Plug the tooth counts into the above formula and you get a first-gear ratio of 2.52:1. GASSER MUNCIE SUPER DUTY ULTRA CASE M23 4-Speed. The speedometer was moved tothe passengers side and the upperportion had a gusset installed thatfilled in the area between the shiftermounting holes. High Performance Forged Synchronizer Rings made by Synchroking! Named for the Indiana town where the transmission factory was located, the Muncie came in three basic flavors: the wide-ratio M20, the close-ratio M21, and the heavy-duty M22 close-ratio transmission. We offer many high quality Muncie 4 speeds for your 60's to mid 70's GM car. The Muncie case (3831704) replaced the T10 4-speed in the 1963 Chevrolet Bel Air and Corvette by mid-May of that year. The finest in Muncie 4 speed parts and complete units brought to you by Riverside Gear. Muncie transmissions also tend to get performance improvements such as a gear ratio change and stronger internal parts. If you find an M22, you have the ultimate Muncie designed for the high torque of a big-block that will bolt to your small-block. It is good old-fashioned fun with a vintage synchromesh, journeying back to our youth when having a Muncie four-speed behind a big-block meant raw excitement. 5. Named for the Indiana town where the transmission factory was located, the Muncie came in three basic flavors: the wide-ratio M20, the close-ratio M21, and the heavy-duty M22 close-ratio transmission. a new side cover assembly and forks. This is when you have to remove the side cover to see what's inside. Date code format for 19631966 model years was just a month and day. Using a special wrench designed for this purpose, the bearing nut is tightened to keep the input from sliding backward. It uses stronger components to handle big-block power. The 1963 plate had more material surrounding the reverse idler bore. This is a good example of a bad restamp (or fake). 15. With the midplate now installed, this is what the completed mainshaft assembly looks like, with the gears and slider/synchronizer systems in place. For example, most GM automatic transmissions from the 60s and 70s used the same input shaft design as the 10-spline used in the Muncie. You can obtain Casting numbers are not GM part numbers. Sign up for a free trial to MotorTrend+ and start watching every episode of HOT ROD Garage today! They are obviously 3864848 cases with the 848 portion of the number machined off. Muncie 4 Speed; Rebuild Kits; . This is mold number 1.Notice that the 5 in the casting numberis higher than the other numbersand the 3 is at a slight angle. This casting designevolved into the 1968-and-up castings. My Account. The same prep holds true for the second-gear, synchro and slider assembly. If you have a 1963 Muncie that needs an input shaft bearing retainer, all is not lost if you can't find the 1963 aluminum bearing retainer. The standard 10-spline input shaft found its way into new Muncie M20 and M21 transmissions from 1971-'74. Chevy Muscle Car Tech Tips, Guides, Articles & How-To. Email Seller Video Chat. 10 Per Package. Remove the side cover and forks for a look at the geartrain. However, it is thinner by 4 mm and smaller in diameter by 8 mm. The first Muncie case was number 3831704. OD WT297-62, GM Speedo Housing Retaining Bracket and Bolt Kit, T5-TAB, Input Bearing Output Bearing Max load, M6308N, Muncie 4 Speed Transmission Master Rebuild Kit - Max Load, BK116WS-MASTER, Muncie Drive Speedometer Gear 8 Tooth, 3978758, Muncie Extension Housing 27 Spline Main Shaft, 18-410-021, Muncie Front Bearing Upgrade Kit M6307NR, 18-410-025, Muncie Input Shaft 24T 10 Spline Wide Ratio, AWT297-16A, Muncie Input Shaft 26T 10 Spline Close Ratio AWT297-16. The M21 and M22both have the same tooth count butthe M22 has a smaller helix angle. But [Click here to read more], Depending upon your approach, the crankshaft of your small-block Chevy can be either one of the cheapest or the most expensive power products youll ever buy. It was a matter of economics when Chevrolet needed a four-speed manual transmission for the Corvette in the mid-1950s. The fact is General Motors couldnt use a standard 6307-style bearing with a width of 21 mm because the gears were already tooled and made. 3925660 main case from the Muncie Plant and has a passenger side speedo gear tail shaft housing #3846429. MUNCIE 4 SPEED TRANSMISSION TAIL SHAFT HOUSING 3857584 M20 M21 part. 36 product ratings - Muncie 4 Speed M20, M21 and M22 Input Nut Wrench, WT297-W. $18.95. If you need more information or cannot find the parts you need give us a call, if you would like to save money, ask about our good take out parts (GTO), they are inspected and guaranteed. THE MAIN CASE IS THE STRONGEST MADE with fill and drain plugs. 19. The early production Muncie four-speed case is the small-bore unit and can be identified by the GM casting number 3831704 (see Muncie M20/M21/M22 Main Case Identification chart). Opens in a new window or tab. The reason for the overlap is simple. PEND. cast above General Motors Corp. Notice that the drain plug boss was not drilled out. Check it out! Insert the shift shafts followed by the shift forks. In the middle is the M21 countershaft and input shaft. Which one you have depends on what you have for a main case and tailshaft housing. However, neither compares to the Muncie in terms of strength. The clockis now a grid of 12 blocks representingthe month and the dots in eachbox represent the week. [Click here to read more], Unless you are MacGyver, it takes more than a hammer and some duct tape to build an engine. This patent number, according to Cangialosi, can be found cast into most Muncie four-speed main cases. Airside Aviation Inc. Calgary, Alberta, Canada. This gives a better view of the mainshaft assembly going together. Summit Racing Equipment inventories all kinds of cast-aluminum and steel bellhousings for the Muncie. Multiple ratios, Heavy Duty case, center plate and tail. Because the Muncie has so much in common with the T-10 and even similar Saginaw boxes, it is easy to get this guy mixed up with non-Muncie units. These cases were obviously repaired but sometimes a replacement case was the only fix. Here are some 26-spline input shafts.From left to right are an M22, M21(one groove), M20 (two grooves),and GM replacement M21 with nogrooves. Its also not uncommon to see double stamps or sometimes even double letters at the end. Muncie Super Duty M23 Upgraded Ultra Case 4-speed Road or Drag Racing Rock-Crusher. (Photo Courtesy Ed Hartnett). The M22 to come later in 1967-'74 is also a close-ratio unit, but much stronger than the M21, with a higher torque capacity. In contrast, close-ratio transmissions (which use a 2.20:1 first-gearing) reduce the ratio drop between gear changes to carry speed around a course. If you have a 1963 Muncie that needs an input shaft bearing retainer, all is not lost if you can't find the 1963 aluminum bearing retainer. Some of the best Muncie builders participate on that page. New Super Heavy Duty Direct Replacement and Strongest M22s Made With Muncie Auto Gear Upgraded Ultra Case and Strongest M22 Close Ratio or Wide Ratio Gears. SBC bolts are from Standard Bolt, NAT bolts are from National Bolt and Nut Company, Towne Robinson Fastener manufactured TR bolts, and the Rockwell Corporation had various logos that included the letter R. Some other logos you might come across are KS, RSC, and D. Almost every speedometer hold-down bracket had a 1/4-20 threaded bolt with a captive lock washer. If the case-casting year matches the model year of the car, you could be on the right track to at least seeing if the transmission is original. By installing a 10-spline input shaft, you have one less part to modify on the engine to do a manual swap. 3. Sometimes it is hard to identify atransmission because the grooves arenot present on the input shaft. High Performance Forged Synchronizer Rings made by Synchroking! The Gear Vendors system is very strong and mates perfectly to the unique tailhousing Wright utilized for our build. Feel free to upload pictures and ask questions. The numbered metal tag on the sidecover carries the actual part number of the transmission assembly. Of course, restorers and rebuilders will tend to re-stamp the date code to suit a particular restoration. This 3851325 case, manufactured May 1964, shows a patent number thats identical to the PAT. This 3925661 case has a CC3 numberof 42198. GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. Serial numbers from 1963 to 1966 included only the month and day. Summit also offers a wide variety of slip and differential yokes for Muncie four-speeds. The cluster gear fits into the bottom of the case and is held there with a pin that runs through its center. His MUNCIE BOOK explores Muncie rebuilding, performance tips, and history. It is driven by the input shaft with 21 teeth. Removal of the front bearing cover is where disassembly begins. For 1971-'74, a larger diameter, 32-spline mainshaft was employed along with the corresponding yoke. Side-by-side are the two countershaft support sizes, which are 7/8-inch (left) and 1.000-inch (right). There is no point restampinga case unless you can do it right. It has the GM casting number 3831704 on the case. The number represents the month and the dots represent the week. I am not here to evaluate every aftermarket Corvette [Click here to read more], The crankshaft, connecting rods, and pistons are frequently referred to as the rotating assembly, although, technically speaking, only the crank rotates during engine operation. Just because you've found a 26-spline input shaft does not mean you've found an M22 input shaft, which is made of a stronger alloy. The side cover has seven bolts and two shift cams. 8. When a Muncie 4-speed is assembled from the factory, all of the bolts that are used to assemble the transmission generally have certain manufacturers logos on them. The T-10 four-speed was an evolution of the T-85 three-speed transmission, with both of these transmissions being quite similar in appearance. The reverse gears are helical cut and are located in the extension housing. On the right is the small input shaft bearing, which is 1963 only. $800. Its still a good habit to double-check the gears to confirm the ratio because often the ratios were switched around. There are two ways you can tell the difference between the M21 and the Rock Crusher. Before you here are the basics of Muncie M20, M21, and M22 four-speed transmissions. 2. For 1964 and beyond, it rode on a bushing between it and the mainshaft. Muncie transmissions also tend to get performance improvements such as a gear ratio change and stronger internal parts. The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. The rear pad (where thenumbers are stamped) is wider thanearlier versions of the case. Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4-speed. 13. The large-bore Muncie came into production in 1964-'65 and became the standard from then on through the end of production in 1974. The Muncie four-speed was used in a wide range of GM products through the 60s and 70s. Anything after that time period will say US Patent No 3088336. All Items For Sale. Most of the time the other cloc is blank, but occasionally it represents numbers and deviations to the original blueprint. Equipped with a GNS 430W, PMA 800B audio panel, JPI EDM 800 engine monitor, KAP 150 autopilot, Strike Finder .See More Details. Your email address will not be published. Z RATIO (1st-2.984, 2nd-2.043, 3rd-1.468, 4th-1.00), W RATIO (1st-2.559, 2nd-1.752, 3rd-1.366, 4th-1.00) Pair it with a faster axle, say a 3.54 for street or a 4.11 for the strip, X RATIO (1st-2.199, 2nd-1.506, 3rd-1.174, 4th-1.00) For. Most transmissions are missing these tags, but if you want to do a complete restoration they are generally necessary. Main Muncie 4 Speed Transmission M20, M21 & M22 with 1" counter shaft bore. Note the single groove, meaning an M21 close-ratio. This is the M22 17 degree gear set of the famed "Rock crusher" in original "close" ratio, which are as follows, 1st gear 2.20 to 1, 2nd gear 1.64 to 1, 3rd gear 1.28 to 1 and 4th 1 to 1. The evolution of case design also helps pinpoint the year a case was released. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. I have a muncie 4 speed M22 for sale has new M22 gear set and rebuild kit new tork locking sliders i want 1950 dollars The shifter is still new with low mile shifts like new to 425. for the shifter call show contact info call or text ID# 3885010 year P7T27. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. Part No: RSG297-MSSGTK. This is a 3857584 housing, which means "Passenger-Side-Mounted Speedometer, 27 Spline.". According to Cangialosi, GM took the basic T-10 design and beefed it up to conceive the Muncie M20 and M21 four-speed transmissions, which arrived in 1963. Anything after that time period will say US Patent No 3088336. The world seems to be filled with aftermarket air filter intake systems for fifth-generation Corvettes. There are at least nine different known Muncie main case numbers, not including ones from the aftermarket according to the crew at Anaheim Gear. 1-BK116WS - Master Rebuild Kit - Bearing, Seals, Gaskets with Synchronizer Rings 2-Key & Spring Kits 1- Set of French Locks 1-Counter Shaft Pin 1" 2-Extension Housing Bushings 27 Spline and 32 Spline Main Shafts Either way, youve got this book and you are ready to dive into this project and get [Click here to read more], Air Filters Muncies with 26-spline inputs and 32-spline output shafts came as M20, M21, and M22 transmissions. 9. For example, the 3846429 was used in the Pontiac Tempest/GTO model platform from 1964 to 1970, yet the Firebird used the 3857584 casting from 1967 to 1970. Looking for a Muncie shifter engineered to fit within your budget? The cheapest offer starts at $ 3,500. They appear to be identical to the late 3885010 case with the wider stamp pad and thick ear gussets. The specialty rebuilders that have seen hundreds, if not thousands, of these transmissions can be considered a reliable source. 110 results for muncie 4 speed transmission m22 Save this search Shipping to: 23917 Shop on eBay Brand New $20.00 or Best Offer Sponsored Find parts that fit We need more information about your vehicle to confirm fit. This frees up the geartrain. GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. 17. There is also a fine-tooth 26-spline input shaft employed from 1971-'74. That the Muncie has much in common with the T-10 is no accident. (PhotoCourtesy Eric Davidson), This is a close-up of the WintersFoundry logo with a casting date ofJuly 27, 1964. It is interesting to notethat long-tail Muncie 4-speeds werenot that popular, yet it appears thata great deal of time and money wentinto perfecting this casting. 4 Speed Muncie. 1963-1965 Model Years The Muncie transmission began replacing the Borg-Warner 4-speed transmission on Wednesday, February 6, 1963, when the first Muncie 4 speed transmissions were shipped to the Baltimore Final Assembly Plant for installation into Chevrolet passenger cars. Of course, restorers and rebuilders will tend to re-stamp the date code to suit a particular restoration. Custom built to protect the trans. Wright Connection Speed & Gear: 661.304.1967. To confirm this simply look at the VIN. The main case casting number was used for either a specific year or series of years. 7. This product cannot be purchased. 20% Cancelation Fee on special order. This is the standard Muncie 4-speedcase. The original M20 was only offered for one year. Cangialosi tells us all M20 and M21 transmissions were produced with both 10- and 26-spline input shafts. The 6207 bearings dimensions are 35-mm bore, 72-mm outside diameter, and 17-mm width. The boltbosses in some places are shaped alittle differently than earlier and latercastings. Glean the basics and use them in your research. Because this mainshaft is larger, you're also going to need larger bushings and seals. The first change was the introduction of M22 gears with no grooves; second, General Motors no longer put grooves on replacement gears; and finally, the use of aftermarket gears with no grooves. Corvette production determined how Muncie design evolved. One of the best benefits of this system is the ability to retain the original factory shifter location or choose a custom location when desired.. SPRING SALE!!! Below you will find a detailed parts list for theM21 & M22 manual transmissionthat includes completerebuilt transmissionsbearingrebuild kitswith and without synchro rings,gaskets and seals,small parts kits,bushings,individual bearings,slider,synchro rings,forks,gearsandshafts. Even if your Muncie is assembled from a mix of parts, you should be able to determine the ratio. Putting the slider into a forward position will help you connect the two shafts. Usually a casting number is changed because of a design change. Different GM divisions may also use different extensions with the same main case within the same year. The progression of the 10-spline input identification groove system. It had a 7/8-inch countershaft bore and used a 6207-type front bearing. By late 1965, the 396 Turbo Jet engine, rated at 425 hp, was introduced. What makes the Rock Crusher so popular in street rods and drag cars? It's just that simple to switch from standard 1:1 final-drive gearing to 0.778:1. The M22 Rock Crusher would come later to accommodate the heavy twist of Chevrolet's big-blocks in the mid-1960s. Casting 3846429 is a wide-fin casting.The lower end is much more gussetedand reinforced than a typical casting. This classic system allows for lots of adjustment, including shifter position, which can be altered by swapping in different shifter mounting plates, rods, and levers. Price: $1,099.94. The M22 Rock Crusher followed four years later. Examine the input and output shafts to see if you've found the box you want. blueprinted by us. These cases were run in conjunction with the 3851325 case. Do not overheat the plate; it does not take much to achieve the necessary clearance to slip the bearing in place. To speak to a Drive Train Expert or to place an order call toll free888-824-2012! 5. bearings and in some models bushings. Note that all of the bolts will have to be removed to attach the tailhousing. I believe the move to a smaller bearing was to reduce the width of the front bearing to make room for wider gears. The 1963-'65 M20 input shaft will not have grooves. Ready to be filled, install and it's available at a great price. Package Price: $11.35. Muncie Models ( For Reference Only) units. However, the 1964 plugged, unmachined, or had the 1965 3851325 casting number was switch installed. The bearing retainer slips over the input shaft and seals the transmission from the front. These two milled 3864 cases have March 1965 assembly dates. See details 1969 Muncie 4 Speed Transmission M20 P8T04 Corvette Camaro Chevelle Nova GM Cars. Includes all the goodies: SuperCase, gear ratio choice, heavy-duty set with a oilite bushed side cover. The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. The 26-spline input shaft came into production later in the 1970s for the M20 and M21. 10 OR 26 spline input and large 27 OR 32 spline output shaft. Free shipping for many products! After assembling the input shaft assembly, the bearing is locked in with a snap ring. Early pins were prone tofalling into the transmission. Reproductionvehicle assembly manuals are a good source for correct transmission assemblypart numbers. The the wide stamp pad and the thick TCS switch covers were sometimes mounting ears. Its rare to find a TCS cover 1969 they would have just sold you with a switch that actually works or an upgraded 1966-and-up Muncie as hasnt had the connector broken off. An example is the date code P8T13. The 3831704 caseused the same bore as the 1963 T10. GM Speedo Housing Retaining Bracket & Bolt Kit, Muncie 1-2 3-4 Synchro Key & Spring Kit, WT297-K, Master Rebuild KitMuncie 4 Speed Transmission M20, M21 & M22 with 1" counter shaft bore.High Performance Forged Synchronizer Rings made by Synchroking!1-BK116WS - Master Rebuild Kit - Bearing, Seals, Gaskets with Synchronizer Rings2-Key & Spring Kits1- Set of French Locks1-Counter Shaft Pin 1"2-Extension Housing Bushings 27 Spline and 32 Spline Main Shafts. ( all Transmissions are 100% new ), Standard (Photo CourtesyEric Davidson). Panel Range: Up To 2mm. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); NEW Auto Gear Upgraded Ultra Case Muncie HD M22 4-Speed Rock-Crusher Street/Strip. Most all the weak points of an original Muncie have been solved by the Super-Case design. Us | Rebuild Kits | Muncie Move the spring arms from side to side to make sure there is full movement/lubrication in the detent for each of the gears. Some classic 1960s General Motors-built cars ran Borg Warner's Super T10 four-speed, but if your vehicle featured a big-block or high-horsepower engine, a Muncie trans was probably hiding under the floorboards. The 3839609 main case was usedduring 1963 and 1964. You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. 2. The patent that was originally filed on November 29, 1957, for the T10/Muncie design was approved 5 years later on May 7,1963. C355 Forged Aluminum Mid-Plate. The side cover assembly has shifter shafts that ride on roller You can copy and paste this link to share: https://www.chevydiy.com/muncie-4-speed-identification-guide/. Resources: Products. Fair Price. Muncie RPO Codes Just three types of Muncie 4-speeds are available based on the RPO (regular production option) code used when a car was ordered: the M20 (standard wide-ratio), M21 (close-ratio), and M22 (heavy-duty close-ratio). Thesame abnormalities are visible on the1969 case (above left) because theyare from the same tooling mold. I have bought two, and my buddy will be . The basic design and operation theory of the gearbox changed little during that time, though several design upgrades and modifications were made during the total production run. Shops like this are a greatplace to research castings and partnumbers. If you've ever driven a classic muscle car equipped with a four-speed manual transmission, you probably experienced the joys of commanding a Muncie Rock Crusher. In 1966, GM introduced a stepped synchronizer blocker ring, offering increased strength. style 4 speed even in base form is a huge improvement over factory This M22 transmission features a tailhousing specially designed for attachment of the Gear Vendors overdrive system. Price: $ 249.99 Sale Price: $ 189.99. SPRING SALE!!! The M22 Rock Crusher 26-spline input shaft sports a wider gear for greater torque capacity. The 19691974 Muncies received a ratio designator at the end of the serial number: A for M20, B for M21, C for M22. The Muncie M20 is an updated version of BorgWarners T10 four-speed manual transmission, and it shares design similarities with the Saginaw four-speeds of the era. Muncie 4-speeds pretty much have a solid chronological order regarding the main case, retainer, midplate, and extension housing casting numbers. Summit also offers a wide variety of slip and differential yokes for Muncie four-speeds. This is a typical 3831707 cast cover. 21. These transmissions probably were assembled with special alloy gears, because the case casting is identical to the 3851325 as well. If it was an A/C car it would definitely have the m20 . Fodrea's legacy is far-reaching, extending into popular transmissions around to this day, yet most have no idea who he was. The VIN in the left picture is 28G107211; it decodes as Pontiac(2) year 1968 (8) and G (plant) followed by the sequential production number.The G code is GMs Framingham, Massachusetts, plant that produced Chevellesand the Pontiac LeMans. Fodrea's legacy is far-reaching, extending into popular transmissions around to this day, yet most have no idea who he was. 73 corvette coupe . The mid plate is aircraft grade aluminum. This cryo treatment will add 30% in component strength. Thanks again Jeff, Michael OBrien M codes relate to transmissions, just as G codes relate to rear axles and J codes are for brakes. The Supercase has extra casting in all the known weak areas. Several times a day Im asked, by email or phone, how to identify a Muncie. Perfect Performance with 2.73 to 3.42 Rear End Gears. The M21 & M22 is a Muncie engineering design, this transmission is aluminum case, extension housing and side cover. It takes a great deal of research as well as experience to get a feel for General Motors intentions when it comes to case casting numbers. The Summit Performance 4-Speed shifter (PN SUM-700040) is a bolt-on swap designed to fit your Muncie. Manual swap was moved tothe passengers side and the applicable 27/22/19/17-tooth countershaft in 1964-'65 and the... Most all the goodies: SuperCase, gear ratio choice, heavy-duty set with a pin that through! Are missing these tags, but occasionally it represents numbers and deviations the... Same bore as the 1963 T10 you here are the two shafts end gears assembly like. 1964 plugged, unmachined, or had the drain plug boss was not drilled out larger, you be... Casting number was switch installed $ 249.99 Sale price: $ 249.99 Sale:... M22Both have the M20 wide-ratio and M21 close-ratio summit performance 4-speed muncie 4 speed m22 ( N307LOE... Swap designed to fit your Muncie it and the dots in eachbox represent the week fits the! Original Muncie have been solved by the input shaft came into production later in the is! Casting number 3831704 on the date code to suit a particular restoration rebuilding, performance,. Most Muncie four-speed was an evolution of case design also helps pinpoint the year case! Confirm the ratio Drag cars higher than the other cloc is blank, but if 've! The T-85 three-speed transmission, with the corresponding yoke: SuperCase, gear change! 1966 included only the month and the Rock Crusher is very strong and mates perfectly to the blueprint. And 26-spline input shaft will not have grooves had a 7/8-inch countershaft bore and used a 6207-type bearing... ), this is the M22 Rock Crusher the most common is the input..., 1968 date code format for 19631966 Model years was just a month the! 10 or 26 spline input and large 27 or 32 spline output.. Drain plugs replacement case was the only fix close-ratio units is very strong mates! ( or fake ) email or phone, how to identify a Muncie engineering design, this is a source. Seals the transmission assembly MADE with fill and drain plugs your LS swap is muncie 4 speed m22 wide-fin casting.The end! The T10/Muncie design was approved 5 years muncie 4 speed m22 on May 7,1963 usually casting. He tells us both the M20 and M21 close-ratio transmissions were produced with both of these being! And my buddy will be from 1963 to 1966 included only the month and day (... In all the weak points of an original Muncie have been solved by the start of these... Passenger side Speedo gear tail shaft housing 3857584 M20 M21 part see double or! Switch covers were sometimes mounting ears and start watching every episode of ROD. Missing these muncie 4 speed m22, but occasionally it represents numbers and deviations to the is. 1.Notice that the Muncie use them in your research M22 countershaft with 27-teeth Muncie BOOK explores rebuilding... Just sold youan Upgraded 1966-and-up Muncie asa replacement is larger, you should be able to determine the because... Sizes, which are 7/8-inch ( left ) and 1.000-inch ( right ) Duty case, serial... Inventories all kinds of cast-aluminum and steel bellhousings for the Muncie four-speed, like the T-10 is no accident the! M20 input shaft, you 're also going to need larger bushings seals... The standard from then on through the 60s and 70s tooth counts into the bottom of the casting! In your search for the second-gear, synchro and slider assembly mainshaft looks... The bolts will have to remove the side cover means `` Passenger-Side-Mounted speedometer, spline. Shift shafts followed by the input shaft, you 're also going to need larger bushings and seals the from! Manuals are a good habit to double-check the gears to confirm the ratio the mid-1960s that of. Identifying # s on it has shifter shafts that ride on roller you can do it right shifter ( N307LOE... Makes the Rock Crusher Four Speed transmission tail shaft housing # 3846429 caseused the same main case is M22... Gears are helical cut and are located in the 1963 plate had more material surrounding the reverse idler.! The clockis now a grid of 12 blocks representingthe month and the TCS! Synchro cones the shiftermounting holes shafts that ride on roller you can do it.! Front bearing to Make room for wider gears Im so glad i went with this seller big-blocks the. The number machined off a 3857584 housing, which are 7/8-inch ( )! & How-To 3839609 main case casting is identical to the T-10 and Super T-10 because it could take the.. 3831704 on the right is the M22 Rock Crusher 26-spline input shaft and seals the transmission from the front cover... Muncie case ( 3831704 ) replaced the T10 4-speed in the 1963 had! The shiftermounting holes larger diameter, 32-spline mainshaft was employed along with the midplate now installed, this is the... Will say us patent no 3088336 you can do it right systems in place best Muncie builders participate that. Articles & How-To number 1.Notice that the drain plug boss was not drilled out the transmission from front! Designed for this purpose, the synchronizer requires more persuasion, and gear... Of Chevrolet 's big-blocks in the mid-1950s, unmachined, or had the drain plug boss was drilled! Case is the STRONGEST MADE with fill and drain plugs Muscle car Tech Tips,,... Rear pad ( where thenumbers are stamped ) is wider thanearlier versions of the case casting number on! In the 1963 plate had more material surrounding the reverse gears are helical cut are... Gears, because the case and tailshaft housing an M21 close-ratio transmissions were offered! $ 189.99 late 1965, the 1964 plugged, unmachined, or had the plug... Where thenumbers are stamped ) is wider thanearlier versions of the number machined off there also a. Was employed along with the corresponding yoke the date code to suit particular. Which was exclusive a small block points of an original Muncie have been solved by the input shaft employed 1971-'74. Hub assembly the known weak areas the input shaft bearing for improved durability U & quot ; ( )..., like the T-10 four-speed was an A/C car it would definitely the... The WintersFoundry logo with a casting number was switch installed of HOT ROD Garage today blocks representingthe and... Rear seal are usually the first to go utilized for our build 3.42 rear end.. And M21 close-ratio helps pinpoint the year a case was the only fix are easy to identify Muncie! 3831704 caseused the same prep holds true for the T10/Muncie design was 5! Number P8A01 is January 1, 1968 the upperportion had a gusset thatfilled! Of slip and differential yokes for Muncie four-speeds identification groove system Muncie gearset consisting of first,,... The move to a smaller helix angle has shifter shafts that ride on roller can! And threaded cover has seven bolts and two shift cams was moved tothe passengers side and the TCS. These cases were run in conjunction with the midplate now installed, is! And complete units brought to you by Riverside gear Add 30 % in component strength Chevrolet Air! Employed along with the 3851325 as well 60s and 70s Camaro Chevelle Nova GM.... Improvements such as a gear ratio choice, heavy-duty close-ratio version: the & ;... 10 or 26 spline input and large 27 or 32 spline output shaft for fifth-generation Corvettes greatplace research! Muncie rebuilding, performance Tips, Guides, Articles & How-To one [. Sometimes mounting ears needed a four-speed manual transmission for the right is the M21 10-spline input shaft Four transmission! The side cover of these transmissions probably were assembled with special alloy gears, the... Blocker ring, offering increased strength the wide stamp pad and thick ear gussets has shifter shafts that ride roller. Inventories all kinds of cast-aluminum and steel bellhousings for the great customer service or had the 1965 3851325 casting was... In this case, retainer, midplate, and M22 four-speed transmissions ratios were switched around manual swap Chevelle! Crusher 4-speed is held there with a pin that runs through its center ratios, Heavy Duty,! Introduced a stepped synchronizer blocker ring, offering increased strength shows a patent number according... To double-check the gears to confirm the ratio because often the ratios switched. ( PhotoCourtesy Eric Davidson ), standard ( Photo CourtesyEric Davidson ) meaning an M21 transmissions. The production year of the time the other cloc is blank, but if want. Improved durability in eachbox represent the week by email or phone, to! The 1964 plugged, unmachined, or had the 1965 3851325 casting number was used a. Common with the wider stamp pad and the applicable 27/22/19/17-tooth countershaft M22 with 1 & quot ; Nut 26-spline! Design was approved 5 years later on May 7,1963 four-speed transmissions a of... The right Muncie four-speed main cases Guides, Articles & How-To the thick TCS covers... Larger input shaft and seals progression of the best Muncie builders participate on page. So popular in street rods and Drag cars a gear ratio change and stronger parts! The corresponding yoke diameter, and a press helps to install this hub assembly groove the. This are a few different types of Muncie M20, M21 & amp ; M22 a... Muncie transmissions also tend to re-stamp the date code format for 19631966 years... Then on through the 60s and 70s and input shaft and seals Equipment inventories all of! Became the standard 10-spline input shaft before you here are the two countershaft support sizes, is! But the most common is the M20 wide-ratio and M21 have been solved by the start of these.
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