The main case will sport a seven-digit casting number (found above the US Patent No), which is not a GM part number. 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. This picture shows the shifter ball and the controller. Some people dont even have a Muncie. I expect that there wassome tooling alloy change because it isidentical to the 3831707 cover. Here's a typical Muncie gearset consisting of First, Second, and Third gear. These guys stockpiled a lot of parts! Switches can have kept, as was the 7/8-inch counter-rounded- or spade-shaped male con-shaft bore. If you've ever looked at a BorgWarner T-10 and a Muncie four-speed and gotten them mixed up, you are not alone because the Muncie (M20, M21, and M22) is a direct descendant of the T-10 according to Cangialosi. GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. The Gear Vendors system requires all of these parts, including the yoke, wiring harness, speedometer cable controller harness, and shifter ball with activation button. Free shipping for many products! See all 20 photos We began. On the left is the M20 countershaft, which is easily identified by the larger 29-tooth gear. 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. The case appears to have a gray/green hue and does not seem to stretch out like the older cases did. Expect to find various combinations out there because these high-performance four-speed transmissions have been thrashed, trashed, and rebuilt through the decades. Shown here is the M20 10-spline wide-ratio input shaft and counter gear. Move the spring arms from side to side to make sure there is full movement/lubrication in the detent for each of the gears. 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. High Performance Forged Synchronizer Rings made by Synchroking! (Coincidentally, March 1965 seems to be a time when the 396 engine started to migrate into more vehicles, such as Z16 Chevelles, Corvettes, and full-size Impalas.) 7. The internals are installed in the Supercase, iron midplate and heavy duty tail. For example, the serial number P8A01 is January 1, 1968. However, neither compares to the Muncie in terms of strength. C $52.12 + C $78.60 shipping. A gear ratio is a combination of two ratios multiplied together. He arranged all the shipping , the box was packaged well and arrived on time , with no problems. Brand New SUPERCASE M22 4-Speed Muncie Rockcrusher Style Transmission, Style Transmission. It is a date code for when the transmission was assembled based on the model year, not calendar year. Update on new Muncies transmissions as of January 1st 2022. This is called a narrow 6307 bearing (PN N307LOE). The date code stamp is P8T04 for December 04, 1968. It uses much the same gear ratios as the close-ratio M-21, but it can handle much more abuse. A GREAT HEAVY DUTY ROCKCRUSHER FOR YOUR CAMARO, NOVA, CHEVELLE, CORVETTE, GTO,442. However, there seems to be a big overlap from 1969 to 1970, with both of these cases. There are two ways you can tell the difference between the M21 and the Rock Crusher. $650. These casting dates or clocks are not generally necessary to determine what type of Muncie you have. Almost gone. Contrary to popular belief, you cannot tell a 4-speed Muncie is an M22 by looking at the input shaft splines. SPRING SALE! Ultra Pro Super N24 Heavy Duty Muncie 4-Speed. AG Roller Side Cover. NOS Gm flywheel 14088646 86-92 Camaro, Firebird and 86-91 Corvette. This will determine the individual gear selection. In Stock. 19. How to Identify Muncie 4 Speed Transmissions. Most of thesecastings look very rough. 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. View Photos. This early type is onlyfound in 1963 transmissions. Good, solid, rugged construction makes it a terrific drop-in for around $100. units. Because this mainshaft is larger, you're also going to need larger bushings and seals. 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. The 3831704 caseused the same bore as the 1963 T10. Muncie transmissions also tend to get performance improvements such as a gear ratio change and stronger internal parts. High Performance Forged Synchronizer Rings made by Synchroking! New Super Heavy Duty Direct Replacement and Strongest M22's Made With Muncie Auto Gear Upgraded Ultra Case and Strongest M22 Close Ratio or Wide Ratio Gears. Below we provide a M21 & M22parts illustrationto assist you with the correct identification of the parts you need. Craig, MO. 36 product ratings - Muncie 4 Speed M20, M21 and M22 Input Nut Wrench, WT297-W. $18.95. SPECIAL RUNS THIS WEEK. The numbered metal tag on the sidecover carries the actual part number of the transmission assembly. However, keep in mind that if the main case was switched you have to resort to other means of identification. This patent number, according to Cangialosi, can be found cast into most Muncie four-speed main cases. It was much easier to stockpile Muncie spare parts and cores in the 1970s than it is today. Multiple ratios, Heavy Duty case, center plate and tail. SPRING SALE!!! Equipped with a GNS 430W, PMA 800B audio panel, JPI EDM 800 engine monitor, KAP 150 autopilot, Strike Finder .See More Details. The M21 & M22 is a four speed, RWD or 4WD transmission. What you will find in your search for the right Muncie four-speed is conflicting information from different sources. Anything after that time period will say US Patent No 3088336. Muncie 4 Speed Transmission M20, M21 & M22 with 1" counter shaft bore. This is a rare WintersFoundry sand-cast piece. The Gear Vendors electric overdrive allows for a 0.778:1-ratio multiplication of the final drive. This a BRAND NEW SUPERCASE M22 Muncie Rockcrusher Style Transmission. Here are three rules that will help you determine which transmission you have: Muncie countergears had the same number of teeth on first-, second-, and third-speed sections. Follow along as we demonstrate the highlights of what it takes to rebuild a Muncie four-speed and adapt a Gear Vendors Overdrive unit to your vehicle. 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). Explore 7 listings for Muncie 4 speed at best prices. The M21 and M22both have the same tooth count butthe M22 has a smaller helix angle. You can obtain The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. Usually a casting number is changed because of a design change. 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 VIN is usually a low number because it was actually going into an early 1968 car. Even if your Muncie is assembled from a mix of parts, you should be able to determine the ratio. This could be an alloy improvement, a casting tool change, or some physical change. Muncie M20 rebuild kits. 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. 9. Panel Range: Up To 2mm. Call888-824-2012for a quote. Casting number revisions are always chronological, which means that a higher number corresponds to a later part. This cryo treatment will add 30% in component strength. Every first gear has 36 teeth, second gear has 30 teeth, and third gear has 27 teeth. Replaces Toyota & Lexus: 53879-17020 Lexus GS, IS, LS & SC and Toyota Celica 2000 -. Before you here are the basics of Muncie M20, M21, and M22 four-speed transmissions. bearings and in some models bushings. Most of the books and articles I have seen, combined with some bits of Internet folklore, tend to have the same flaws because most information is copied and simply edited and resubmitted. Click Image For More Details: Reverse Gear Set Muncie 4 Speed ON SALE NOW. The tailhousing slips on in this manner. However, neither compares to the Muncie in terms of strength. Us | Rebuild Kits | Muncie The Saginaw four-speed box is quite similar to both the T-10 and Muncie four-speed transmissions. Airside Aviation Inc. Calgary, Alberta, Canada. RACING Muncie Slick Shift Clutch-less Super Duty M23 Upgraded Ultra Case 4-speed Drag Racing Rock-Crusher. That the Muncie has much in common with the T-10 is no accident. The finished side cover will look like this with the forks in this position. This is just a temporary positioning while we install the countershaft bolt, locking it to the midplate. We have the best prices on Muncie 4 speed parts, including Chevy Muncie 4 speed transmission parts, and we can guarantee you a great selection of items extending from the 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. Serial numbers from 1963 to 1966 included only the month and day. What you can see is that before March 1965 these cases were not milled. Again, Thank You for the great customer service. Opens in a new window or tab. I can guarantee that most people reading this book will never see some of the items Ive stumbled across. If you have to replace an early 7/8-inch case, a later casting is offered with the thick ears but machined for the early shaft. 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. Sale Price: $799.99. Part No: RSG297-RGS-All. From 1971 through the end of production in 1974, the M20 got the 26-spline input shaft. Click Image For More Details: Mainshaft Reverse Gear Muncie 4 Speed. Price: $ 249.99 Sale Price: $ 189.99. RTS / SROD 3 Speed Overdrive Transmission Parts, BW4422, BW4424, BW4462 Transfer Case Parts, BW4484, BW4485, BW4493 Transfer Case Parts, Rebuilt Cadillac CTS-V TR6060 Transmission, Extension Housing Bushing 1.630 OD, 35008, Extension Housing Bushing 2.010 Inch. 1. On the right is the M22 countershaft with 27-teeth. 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Is just a temporary positioning while we install the countershaft bolt, locking it to the midplate of.