Across the top of the page are the words "First Build 4/15/65 – 1st Shipment 4/19/65, recap of M22 (Rock Crusher) Trans." By comparing these M22 transmission assemblies to Chevrolet's 1965 transmission identification codes, I found a perfect match. ... All 1963-65 M20 and M21 transmission used a 7/8″ countergear pin in all assemblies.
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The M21 and the M22 are both "close ratios", with the same ratios. The main difference is the helical angle differences with the gear teeth... M21 had a greater angle, which was quieter. The M22 was "closer" to straight-cut, so it was noisier ( not saying it was close to straight-cut, just closer than the M21).
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The straighter angle was designed to produce less end loading of the gear train and less heat but created more noise, thus the nickname "Rock Crusher" was born. Another misconception is if you have a drain plug you have a M22.
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New Super Heavy Duty Direct Replacement Heavy Duty M20 or M21 With Muncie Auto Gear Upgraded Ultra Case. Close Ratio or Wide Ratio Gears. 10 OR 26 spline input and large 27 OR 32 spline output shaft. ... Super Pro Road/Race Muncie Upgraded Ultra Case M22 Rock-Crusher. 2025 Spring SALE!!! Rated 5.00 out of 5 $ 4,199.00 Original price was ...
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I explain this in detail, because like so many BS stories that have occurred over the years, the M22//Rock Crusher is one of them that continues to be perpetuated by "armchair" experts. Originally, the M22 was ONLY a close …
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Upon getting into the restoration I noticed he had an M21 bellhousing attached to a muncie 4 speed. i called him and asked him if he knew what kind of Muncie it was, he steadfastly said it was an M22 Rock Crusher. Now,everyone thinks they have a Rock Crusher...One of my buddies is a self proclaimed "expert".
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The M21 & M22 is a four speed, RWD or 4WD transmission. The M21 & M22 is a Muncie engineering design, this transmission is aluminum case, extension housing and side cover. The side cover has seven bolts and two …
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An M-22 "Rock Crusher" is a Muncie four-speed transmission for cars made by General Motors in the 1960s. Identify a transmission type correctly before fitting it into your car. If you have the incorrect transmission, your car may not function properly. You can identify several unique signs that identify an M-22 "Rock Crusher," even if it does ...
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ORIGINALLY, in the beginning of the Muncie evolution, there was the M20(wide ratio) and the M21(close ratio). ... ONLY AND ALL M22 MUNCIES ARE CALLED ROCK CRUSHER! For folks who may not be familiar with the …
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The M22 was eventually dubbed the "Rock Crusher". It is a common misconception that all Muncie transmissions are "Rock Crushers", but it is only the M22 that deserves that name. The M20 and M21 were both release in …
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Muncie M21 4 Speed Transmission Rock Crusher Close Ratio 2.20 3925661. schiadarivertunnel (4533) positive; Seller's other items Seller's other items; Contact seller; US $800.00. 0 bids. Ends in 6d 21h. US $2,000.00. Buy It Now. No Interest if paid in full in 6 mo on $99+ with PayPal Credit * Condition:
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Muncie M22 Rock Crusher Is The Rarest 1960s Muscle Car Transmission ... The key difference between the Muncie M20 and M21 gearboxes was that the M20 was the wide-ratio model, while the M21 was the ...
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The Muncie M22 is known as the Rock Crusher. See how we improve its strength and versatility by adding a Gear Vendors Overdrive. ... the close-ratio M21, and the heavy-duty M22 close-ratio ...
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2. 04 represents the month code when the unit was assembled, April. 3. 21 represents the day of the month the unit was assembled, the 21st day of April.
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muncie m21 vs m22. Jump to Latest ... I have heard that the m22 "rock crusher" is the best tranny for high horsepower applications. What about the m21? How reliable is a rebuilt m21 in mid to high horsepower applications? Save Share Like. Sort by Oldest first Oldest first ...
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1969-1974 codes include a suffix letter at the end to aid in identification of transmission ratios. A = 2.52 1st gear wide ratio M20, B=2.20 1st gear close ratio M21, C = 2.20 first gear Rock Crusher M22. One example code would be ( P0E21 A ) which reads: Muncie four speed aluminum for passenger car, 1970, May, 21st, ratio M20.
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C3 General - M22 Rock Crusher - Just bought a 1968 (originally was 427/435..currently has a CE replacement block from 69)) and I believe it has a M22 vice M21. Intent at some point in the near future is to crawl under and check numbers/code. I know it has the factory 411 rear end (Code FB) so that is the first reason...
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Typically, the M20/M21 gearsets have a first-gear helix angle of 26.4 degrees and an input shaft angle of 39 degrees. The reduction in the angle with the M22 is quite substantial. The M22 first gear has an angle of 14.5 degrees and the input shaft is 24.2 degrees.
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As Gary has mentioned, a properly built M21 or M20 Muncie should not have excessive gear whine like an M22 "rock crusher". Autogear does not manufacture the Italian made M21 gearset. So, I would suspect you have the Chinese or Taiwanese M21 gearset, these gearsets will be noisy and whine.
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The most popular question has to be that everyone thinks they have the famous "rockcrusher" M22 4 speed. This had the same gear ratios as the M21 but with a heavy duty gearset. The reason you may ask? Well it wasn't designed so that …
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Muncie Gasket Set M20 M21 M22 1963 -1974. Complete Muncie gasket set for all Muncie transmissions. From $19.95 . ... The Rock Crusher earned its name from the audible noise it produced, resembling the crushing of rocks, and it quickly gained popularity among drag racers and street racers alike. ...
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Rick, I'm not the expert on these here, DZauto is but here it goes. The M22 is the "rockcrusher" tranny. It's a bit more heavy duty than the M21 and much rarer. It's called a rockcrusher due to it straighter cut gears which whine ( and are stronger ). The M21 is a standard Muncie 4 speed. They both have the same ratios beginning with a 2.20 1st.
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Muncie M22 Rock Crusher Second Gear $ 115.00 Add to cart; Muncie 4 Speed O-Ring Speedometer Housing $ 1.00 Add to cart; Muncie M20/M21/M22 Rear Reverse Idler Gear $ 59.00 Add to cart; Technical Resources. Competition Plus Catalog; Installation Instructions for Hurst Shifters; Muncie Identification;
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Muncie M22 Rock Crusher Second Gear quantity. Add to cart. SKU: M297-21A Category: Transmission Parts. Additional information Reviews (0) Additional information. Brand: Muncie. Tooth Count: 30T. Year: 66-74. Reviews ... Muncie M21 2.20 Close Ratio Cluster Gear 1″ ...
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Because M21 is just a code, later Corvettes or other 4-speed cars didn't have Muncies; those equipped with a Super T10 4-speed could have an M21 or an M20 code. Window and tank sticker resources reveal that there was never an M21 …
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You have a choice of a original completely rebuilt GM Muncie M20, M21 or M22 Rock Crusher transmission. With this new kit you also get all the hardware needed to get the job done right the first time. Correct bolts will include head markings like original. The transmission is professionally rebuilt and guaranteed for 1 year.
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The dead 2.20 first gear ratio which is the same in the M21 is not that good for off the line acceleration. You would need at least a 4.56 rear end gear to compensate for the dead first gear. That was OK when gas was cheap in 1967 and you did not mind pulling 3000 RPM at 50 MPH while going to work. Times and requirements have changed making ...
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I also have a M21 with same close ratio as m22 but with two rings on front spline. @@@@@ M22 specs 10PP229308 stamp on casting 3925661 casting ... " 3000$ on a bolt on, period correct, grin inducing almighty and mythical transmission that is the great Muncie M22 Rock Crusher makes more sense for many compared to buying a retrofit kitted TKX for ...
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The famous "rockcrusher" M22 4 speed had the same gear ratios as the M21 but with a heavy duty gearset. Although the gears are not spur gears ( completely straight ) they still produced a fair amount of gear noise thus the …
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How To Rebuild Muncie 4-Speed Manual Transmission M20 M21 M22 Rock Crusher. Opens in a new window or tab. Brand New. 5.0 out of 5 stars. 43 product ratings - How To Rebuild Muncie 4-Speed Manual Transmission M20 M21 M22 Rock Crusher. $27.40. Buy It Now +$5.95 delivery in 2-4 days. Free returns. 4 watchers.
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Hurry before it's gone. 1 person is watching this item. US $150.00USPS Ground Advantage®. Delivery time is estimated using our proprietary method which is based on the …
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NEW Auto Gear Upgraded Ultra Case Muncie Heavy Duty M20 or M21 4-Speed. Camaro, Corvette, Chevelle, Nova. 2025 Spring SALE!!! ... We also offer muncie rebuild kits, racing parts and m22 rock crusher transmissions. ×. Home; About; FAQs; Contact; Recent Comments. Randall D Resler II on Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4-speed ...
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The M22 Rock Crusher would come later to accommodate the heavy twist of Chevrolet's big-blocks in the mid-1960s. The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and …
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The Muncie four-speed is as legendary as the cars that it was put into, with the M20, M21, and Rock Crusher M22 models all part of the hot rod vernacular. From the OEM factories to racetracks to ...
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How To Rebuild Muncie 4-Speed Manual Transmission M20 M21 M22 Rock Crusher. Opens in a new window or tab. Brand New. 5.0 out of 5 stars. 43 product ratings - How To Rebuild Muncie 4-Speed Manual Transmission M20 M21 M22 Rock Crusher. $27.40. Buy It Now +$5.95 delivery. Free returns. 4 watchers.
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