The 2.20:1 ratio is commonly designated as the Muncie M21 transmission. A Muncie differs from a Saginaw transmission in that its reverse lever is in the tail housing, not the side cover. Muncie Transmission is back! The M22 Rock Crusher would come later to accommodate the heavy … Parts trickled out of inventory by the late 1980's. 744 sold. Contrary to popular belief, you cannot tell a 4-speed Muncie is an M22 by looking at the input shaft splines. ... How to Tell if Your Corvette Has Matching Numbers. input bearing Or they think a Muncie passenger- car transmission is the same as a Muncie truck transmission. This was not done on the M20 or M21 transmissions. $18.63. heavy duty max-load. Muncie produced serial numbers 35000 through 44999. The steeper the angle, the wider the tooth is so in theory, the M22 has the widest teeth and therefore should be a stronger transmission. The early ones had a 2.56:1 first gear. Look at the identification number stamped on the transmission. Muncie 4 Speed Rebuilding DVD is available now. All wide ratio transmissions are designated M20 and close ratio transmissions are designated M21 or M22 depending on the gear set. The Muncie was used in all high performance applications until the Borg-Warner Second Design Super T-10 began replacing it in 1974. C $449.55. The Muncie M20 is basically a wide-ratio transmission and was intended for normal street driving use. M20 input = 21 teeth. There are three basic types of Muncies: M20, M21 and M22. Top Rated Seller. Buy It Now. Pre-Owned. The M22's gear teeth have more angle cut into them than a M20 or M21. Because General Motors ceased installation of Muncie 4-speeds by 1974, a Muncie transmission is at least 40 years old by the time this book goes into print. Muncie also had a second close-ratio transmission coded M22 and known as the "rock crusher," which was used behind performance big-block engines and in some Corvettes. C $1,604.34 10% off. Paul's Intro. - Muncie M20 M21 M22 4 Speed Transmission Input Shaft Bearing N307LOE. From United States. Gary S: I think you have it backwards. They are compatible with a GM 3 Series differential. The last five numbers are sequential serial numbers, and each plant only produced a specific block of them. All documented M22 transmissions have the #3925660 maincase. So you can tell the difference by counting the teeth on the input or the cluster gear that engages the input. M20 gets you a 2.52 1st gear compared to the 2.20 1st in the M21 (and M22) close-ratio box. They are … These are easy to adapt to a wide range of hot rods. The “M” codes are RPO (Regular Production Option) codes. Earlier than you listed here are the fundamentals of Muncie M20, M21, and M22 four-speed transmissions. It's unclear as to why this discrepancy exists. Was: Previous Price. Buy It Now. Muncie M20 M21 M22 Deluxe Rebuild Kit Aluminum 4 Speed GM Transmission 1" Shaft. You are getting ratios by multiplying 2 … Muncie 4 Speed Transmissions. Top Rated Seller. They don’t mean Muncie. The side cover has seven bolts and two shift cams. How can you tell if the transmission in your car is the one the car was originally built with? The 2.20:1 ratio first gear is usually referred to as the Muncie M21 transmission; based on GM's production codes. From United States. What do M20, M21, and M22 actually mean? Also, often, that partial VIN will tell you the model of the car by looking at the assembly plant code. Although not mentioned much, there was also an M23 transmission that was used, beginning in 1970. Otherwise you can tell a difference by spinning the input while in first gear, and counting the revolutions of the input with respect to the output. Muncie takes its name from its home headquarters in Indiana. This is on a 66 to 74 model year Muncie. Early Muncie 4-Speed Identification. The Muncie M21 and M22 close-ratio provide the narrowest range of .. input bearing. Anticipate to discover numerous mixtures on the market as a result of these high-performance four-speed transmissions have been thrashed, trashed, and rebuilt by way of the many years. $169.00. Muncie Transmission ID and Ratio Guide. Add to Cart. Replacement part allows you to correct & replace the early non retained side cover pivot pin. https://www.chevyhardcore.com/.../identify-four-speed-transmissions For close to eight decades, the company has produced quality power components and systems like the Muncie 4-speed transmissions (M20, M21 and M22).It’s easily one of the most popular manual transmissions on the market. The ratios of these pairs are identical in both transmissions. Chat Online; Guide to Muncie M20 M21 and M22 Four-Speed Transmissions If your main goal is to get the rev's down on the highway, you could consider a muncie with the aftermarket "overdrive" ratio set (M22Y, 2.20, 1.51, 1.00, 0.859). Muncie M22 4 Speed Rock Crusher Gear Whine - World… Because the average manual-shift transmission contains more than one pair of Ratios can help determine proper application as well as the torque capacity of a transmission. General Motors stopped installing "Muncie" 4 speeds in 1974. 6 product ratings. Check the numbers on a Muncie. Muncie 4-Speed Transmissions: How To Rebuild & Modify. Brand New. The M23 is recognized by a 26-spline(fine) input shaft and a large output shaft that requires a T-400 driveshaft yoke. One of the most common swaps involves a Muncie 4-speed. Watch. The 2.56:1 ratio is commonly referred to as the M20. Driver’s side of restored 1965 M22 transmission. 80mm outside diameter . They are not. heavy duty max-load input bearing; fits muncie m20, m21, & m22 models from '65+ with 80mm o.d. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. However, GM made both 10- and 26-spline versions of the M20 and M21. Save up to 10% when you buy more. The Muncie has probably been the most popular transmission among the hot rodding set since its inception in 1963. These included a Muncie M22 "Rock Crusher" 4-speed manual transmission or M20 Hydramatic automatic. Also, it will have a partial VIN on it that will identify whether it came from a Chevy, Pontiac, or other GM. +C $47.07 shipping estimate. Muncie 4-speed Transmission (Group 4.000) -. muncie. The later 1966-1974 units had a 2.52:1 first gear. The M21 & M22 is a four speed, RWD or 4WD transmission. All original Muncie transmissions have ring grooves on the input shaft and counter gear. Click here for information. Many people become so focused on price comparisons when purchasing a “rebuilt” Muncie that they frequently overlook what was actually done to the transmission and, more important, who did the work. - Muncie M22 4 Speed Rock Crusher Gear Set, 10 Spline, GK-M22. $12.77 $16.99. The synchro rings have 35 teeth and the unit has a 4 step cluster gear. Many people are always calling me or asking me at shows on how to identify Muncie 4 speeds. (2) All 454 Chevelle applications. All M22s use a 26-spline shaft made from a stronger alloy than the other 4-speeds. Glean the fundamentals and use them in your analysis. GM’s goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. 5.0 out of 5 stars. Muncie Transmission information D & L Transmission To order call 1-631-351-4837. Get Price Also is a replacement for the later shouldered pin. And you're right, Zack, not too many people actually know how to distinguish Esssentially just the head set is ( input and front of countergear is changed). Free shipping. (1) All M22 applications except 454 engine. Feb 21 2010 Although some claim that the M23 is a rock crusher it is indicated that this box was assembled in both wide and close ratio components and also with straight cut gears common to the rock crusher (M22) transmission. C $1,443.91. The most well known Muncie transmissions are the M20(wide ratio), M21(close ratio), and the M22(rock crusher). Buy It Now. People commonly call a Muncie an M21. TH350 , 2-SPEED POWERGLIDE AUTOMATIC, SUPER T10, MUNCIE M20 M21 M22, SAGINAW, & T5 MANUAL TRANSMISSION SPEEDOMETER GEAR 18T BROWN FITS GM (3987918) (8G-18A) TPD PRO-LINE. The M22 was produced in 1973 and 1974 for other GM divisions. m20 m21 m22 '65-'74 4-speed manual transmissions:. The M21 & M22 is a Muncie engineering design, this transmission is aluminum case, extension housing and side cover. Casting Numbers. The Muncie is aluminum-case, but the Saginaw transmission is cast-iron-case. M21 input = 26 teeth. The 2.56:1 ratio is referred to as the M20. Muncie Identification The H.A.M.B. Complete units were able to be purchased from GM until the late 1970's. First the physical properties: The Muncie M20 and M21 share the SAME EXACT physical 1st, 2nd, and 3rd gears. The 1965 M22 maintained the 10-spline input and 27-spline output as all other Muncie transmissions from that model year.The 1965 M22 also had the drain plug boss drilled and tapped for a magnetic drain plug. They will tell you if it is a M20, M21, or M22. 1964-1965 Muncie 4 Speed Wide Ratio Transmission M20 Camaro Chevelle Corvette GM. Top Rated Seller. Free shipping. Muncie detent lever pivot pin will fit all Muncie transmissions, 1963-74 M20, M21, M22. There are two ways you can tell the difference between the M21 and the Rock Crusher. Muncie also had a second close-ratio transmission designated M22 and often referred to as the "rock-crusher," which was used behind the highest-performance engines and in Corvettes, the M22 is a highly sought-after performance transmission. 6 product ratings. Identical in both transmissions use them in your car is the SAME EXACT physical 1st, 2nd and! Wide-Ratio and M21 the most popular transmission among the hot rodding set since its inception in 1963 replacement for later! 4Wd transmission were first offered in 1963 Aluminum 4 Speed wide ratio transmissions are designated M21 or.! Car by looking at the input shaft and counter gear street driving use 3. Lever pivot pin will fit all Muncie transmissions have the # 3925660 maincase three basic types of Muncies M20. ) codes your Corvette has Matching numbers M22 Deluxe Rebuild Kit Aluminum 4 Speed transmission input shaft and gear... 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The synchro rings have 35 teeth and the unit has a 4 step cluster gear be purchased GM!
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