Limited Quantity!! Save your search. This is a BorgWarner replacementM20 26-spline input shaft, which hasno grooves. The M22 Rock Crusher would come later to accommodate the heavy twist of Chevrolet's big-blocks in the mid-1960s. You're going to find various combinations of main cases, tailshaft housings, and side covers coupled with variations inside of each case. All three wereidentical except for the speedometer drive and the driven gears. Airside Aviation Inc. Calgary, Alberta, Canada. It usually begins with 18S101350 or 28N12950. High Performance Forged Synchronizer Rings made by Synchroking! It is a date code for when the transmission was assembled based on the model year, not calendar year. Muncie M20/M21/M22 Main Case Identification, Patent Pending, 7/8-inch Countershaft Bore, Patent Pending, 7/8-inch Countershaft Bore used mostly in 1964, Patent Number, 7/8-inch Countershaft Bore, Patent Number, 1.000-inch Countershaft Bore, Thin Fin Tailshaft, Driver-Side-Mounted Speedometer, 27 Spline Output, Thick Web Tailshaft, Driver-Side-Mounted Speedometer, 27 Spline Output, Pontiac Catalina Long Tailshaft, Side-Mounted-Speedometer, 27 Spline Output, Passenger-Side-Mounted Speedometer, 27 Spline Output, Passenger-Side-Mounted Speedometer, 32 Spline Output, Early Side Cover Used With 3857584 Tailshaft Housing, Late Side Cover - Long Boss - With A Transmission Controlled Spark Switch, Late Side Cover - Short Boss - With A Transmission Controlled Spark Switch, Late Side Cover - Long Boss With A Neutral Safety Switch, Build facility (i.e., P = Muncie Transmission Plant), Month code it was assembled (i.e., 05 = May), Day code it was assembled (i.e., 25 = 25th Day), Month code it was assembled (i.e., D = April) (Beginning in 1967, Muncie used letter codes for the month code: A=Jan, B=Feb, C=Mar, D=Apr, E=May, H=June, K=July, M=Aug, P=Sep, R=Oct, S=Nov, T=Dec), Day code it was assembled (i.e., 12 = 12th Day), Month code it was assembled (i.e., M = August), Day code it was assembled (i.e., 03 = 3rd Day), Gear ratio set (i.e., A=M20) (This code was added to identify ratios. SPECIAL RUNS THIS WEEK. If you have worked on Muncies for any amount of time you have come across cases with welded mounting ears. The boltbosses in some places are shaped alittle differently than earlier and latercastings. The Gear Vendors Overdrive unit features a 32-spline output and the ability to tune your speedometer to achieve accurate readouts. Glean the basics and use them in your research. 17. 1-Counter Shaft Pin 1" Craig applied assembly lube to the inside and face of the rear reverse-idler gear before pinning it in place. There are at least nine different known Muncie main case numbers, not including ones from the aftermarket according to the crew at Anaheim Gear. Muncie 4 Speed Transmission M20, M21 & M22 with 1" counter shaft bore.
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. Muncie M22 4-speed longitudinal heavy duty close ratio manual transmission made by GM at their Muncie, Indiana factory; Saginaw M26/27 transmission 3 and 4-speed longitudinal light duty (less than 300 hp) wide ratio manual transmission made by GM at their Saginaw, Michigan factory; Muncie M62/M64 3-speed longitudinal transmission . !. Even if your Muncie is assembled from a mix of parts, you should be able to determine the ratio. Later cases seem to only have one clock. 5speedscom (7,130) 100%. Thats no coincidence: To save costs and development time, Chevrolet used the T10 as a base design, adding stronger components and larger synchro cones. This is a 3857584 housing, which means "Passenger-Side-Mounted Speedometer, 27 Spline.". The smaller 6207-type bearing replaced the larger 6307 bearing in 1963. Our factoryrebuilt re-manufacturedtransmissions are dyno tested before leaving the factory, ensuring the highest quality, We offer a no hassle 12 month warranty, performance guaranteed. 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. Screw Size: M4.8 (#10) Center Of Hole To Edge: 10mm. Counter Shaft Pin), Small Parts Kit (7/8 OD Counter Shaft) (M20), Small Parts Kit (1 OD Counter Shaft) (M21 M22), Transmission Conversion Kit (Complete) (M21 to M22), Rear Main Shaft Bearing (40mm ID, 23mm Thick, 90mm OD), Rear Main Shaft Bearing (40mm ID, 23mm Thick, 90mm OD) Max load, 1-2 Synchro Ring (Early, Non-Stepped Shoulder), 1-2 Synchro Ring (Late, Stepped Shoulder), 3-4 Synchro Ring (Early, Non-Stepped Shoulder), 3-4 Synchro Ring (Late, Stepped Shoulder), M20 (10 Spline, 7/8 Counter Shaft) Wide Ratio 2.56 1st Gear, M20 (10 Spline, 1 Counter Shaft) Wide Ratio 2.52 1st Gear, M20 (26 1 Counter Shaft) Wide Ratio 2.42 1st Gear, M21 (10 Spline 7/8 Counter Shaft) Close Ratio 2.20 1st Gear, M21 (10 Spline 1 Counter Shaft) Close Ratio 2.20 1st Gear, M21 (26 Spline 1 Counter Shaft) Close Ratio 2.20 1st Gear, M22 (1st Gear Kit) Updated Incl. It was made to avoid longdriveshafts, thus reducing harmonicvibration. High Performance Forged Synchronizer Rings made by Synchroking! The casting clock codes are at right above the fill plug. Free shipping. The mountingboss is a little wider and thicker inplaces than the 3831731. This is April 23, 1972, M21 ratio. From 1963-'70, the Muncie was fitted with a 27-spline mainshaft and must have the corresponding slip yoke. These cases are usuallystamped in two places: on the outsidestamp pad and on the inside gasketsurface. 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. Reproductionvehicle assembly manuals are a good source for correct transmission assemblypart numbers. straight-cut design. Summit Racing Equipment inventories all kinds of cast-aluminum and steel bellhousings for the Muncie. Ultra Pro Super N24 Heavy Duty Ultra Case Muncie 4-Speed. Then theymoved to die-castings; they requireless machine work, are more accurate,and are necessary for high productionnumbers. The internals are installed in the Supercase, In StockWhile Supplies Last! C355 Forged Aluminum Mid-Plate. This page is in place to support this book and its free. Certain make and model GM cars used one type while other models used something different. The first Muncie case was number 3831704. The 26-spline input shaft yields greater torque capacity via the number of teeth and greater surface area. The cases offer a broad range of interchangeability. The clock looks like a mathematical fraction with a 1/2-inch circle around it; they were a way to track any quality-control issues. Few people today will everbe able to amass this number ofMuncie parts. Gear, Spacer, Bushing, Bearing, Gear Conversion Kit (M21 to M22) w/ 10 Spline Input, Gear Conversion Kit (M21 to M22) w/ 26 T & 26 Spline Input Shaft, Gear Conversion Kit (M21 to M22) W/ 21 T & 26 Spline Input Shaft, Input Shaft (21 T) 10 Spline (66-70) (Wide Ratio), Input Shaft (21 T) 26 Spline (71-74) (Wide Ratio), Input Shaft (24 T) 10 Spline (63-65) (Wide Ratio), Input Shaft (26 T) 10 Spline (Except M22) (Close Ratio), Input Shaft (26 T) 10 Spline (M22) (66-77), Input Shaft (26 T) 26 Spline (Except M22) (71-74) (Close Ratio), Cluster Shaft (M20) (27-22-19-17) Close Ratio (63-65), Cluster Shaft (M20) (29-22-19-17) Wide Ration (63-65), Cluster Shaft (M21) (25-22-19-17) Wide Ratio (66-74), Cluster Shaft (M21) (27-22-19-17) Close Ratio (66-74), Cluster Shaft (M22) (27-22-19-17) Close Ratio (66-74), Extension Housing (27 Spline Main Shaft) (Pass. Ratios of the M20 , M21 , M22 . Feel free to upload pictures and ask questions. The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. There is also a fine-tooth 26-spline input shaft employed from 1971-'74. You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. style 4 speed even in base form is a huge improvement over factory Click . 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.. This meant that the transmissions front bearing retainer and register bore of the bellhousing were also smaller in diameter. 4 Speed Muncie. On the left is the M20 countershaft and 10-spline input shaft. Also available arecover and caseand Miscellaneous parts. There are a few different types of Muncie 4 speed, but the most common is the M20. Super Tail. 5.0 out of 5 stars. Trans is perfect, and Im so glad I went with this seller. Author and technician Paul Cangialosi tells us the original U.S. patent for the Muncie four-speed was filed on November 29, 1957, and approved May 7, 1963. View Photos. Which one really improves your cars performance? As mentioned previously, we know that the Muncie came with several ratios. 73 corvette coupe . Italian gear sets, roller bearing clusters, Heavy Duty shift plate (M23 Super Finish shown) Filter Results: 82 found Show Filter The reason for the overlap is simple. That the Muncie has much in common with the T-10 is no accident. $800. Creators of the JT5 Jaguar 5 Speed, new heavy duty M22 Muncie transmissions, rebuild kits for the Muncie, Super T10, T5 and Ford Toploader, books and Youtube videos. This could be an alloy improvement, a casting tool change, or some physical change. Some of these transmissions have serial number date codes stamped on them and some do not. The Gear Vendors system is very strong and mates perfectly to the unique tailhousing Wright utilized for our build. Even if you have a smooth shifting transmission, your gearbox is at least 45 years old. Of course, restorers and rebuilders will tend to re-stamp the date code to suit a particular restoration. It is a later casting design with ers with bolt-on shifter shafts. Cars. A pocket bearing that connects the input shaft with the main shaft is outfitted with a series of roller bearings trapped inside a cage retainer. Lets take a look at how the Muncie main case evolved from 1963 to actually going into an early 1968 car. Remove the side cover and forks for a look at the geartrain. Most all. 5. Perhaps an alloy change as well as a tooling change warranted a new number. This is when you have to remove the side cover to see what's inside. Four are late model. . Remove the side cover and forks for a look at the geartrain. After assembling the input shaft assembly, the bearing is locked in with a snap ring. The ID groove system was good until several things changed. The early 3851325 PAT. This design creates the distinctive low-RPM rattle and high-RPM whine the Rock Crusher is known for. Because the 3885010 case was used in 1966 and 1967, the case without the year designator is a 1966. The cast-iron three-speed retainer, #604932, can be used in place of the aluminum retainer and will be stronger. Expect to find various combinations out there because these high-performance four-speed transmissions have been thrashed, trashed, and rebuilt through the decades. . From 1963-'70, the Muncie was fitted with a 27-spline mainshaft and must have the corresponding slip yoke. Call888-824-2012for a quote. How do you tell a Muncie M20 from M22? This M22 transmission features a tailhousing specially designed for attachment of the Gear Vendors overdrive system. 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