American Chevy Muncie – M20, M21, M22 | Allstate Gear

However, the Rock Crusher was only equipped in cars that had high-performance big blocks, including the Corvette, Camaro, Firebird and Chevelle. Thanks to the similarities between the M20, M21 and M22 transmissions, you can use a combination of Muncie 4-speed transmission parts to build the transmission you want for your project car.

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Guide to Muncie M20, M21, and M22 Four-Speed …

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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M-22 Muncie Rockcrusher for sale

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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Complete Guide to Muncie Transmissions

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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Muncie M21 Transmission

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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Muncie 4-Speed Identification Guide

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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M22 Rock Crusher?

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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American Chevy Muncie – M20, M21, M22 | Allstate Gear

There are two ways you can tell the difference between the M21 and the Rock Crusher. The M22 has 27 teeth on the countershaft gear, while the M20 and M21 have 29 teeth. M20 …

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How to Identify Your Muncie 4-Speed Transmission

M21: Close ratio, for high performance. M22: Known as the "Rock Crusher", designed for high-torque applications. Using these tips, you can confirm whether you have the right transmission for your Chevy and make informed decisions about any potential restorations or modifications. Feel free to share your findings or ask if you have questions ...

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When was the M22 first called "rock crusher"?

I have a suspicion that rock crusher may have first been used in a late-1960s auto magazine test drive, but was hoping the historians in this group might be able to narrow it down. ... 1966 Chevelle SS 396/360 M21 3:73 posi. silver/blue buckets Extraordinary claims require extraordinary evidence.

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Muncie 4 Speed Transmissions

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 Identification | The H.A.M.B.

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. Looks like you have a second design-feb. 28th, 1968, M20 or M21. Definitely not a rock crusher(no straight cut gears).

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M22-Wide vs M22 "Rock Crusher"

We are restoring a 72 Chevelle SS and would like to use a Muncie "Rock Crusher". Is there anyone out there that and tell me the difference between a Muncie M22W and a M22 Rock Crusher. ... The M21 was mostly used by GM on 3.70 & numerically higher ratio rear axles, the M20 on 3.55 & lower ratios. The M22 was set up for the original Z28s to help ...

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How to Identify a Muncie Four Speed: Build Date Codes

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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M-22 "rock crusher"

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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M-22 "rock crusher" | Page 2

Information Exchange. Bench Racing. M-22 "rock crusher"

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The 1965 Chevrolet M22 Rockcrusher Transmission: The Mystical Transmission

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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Muncie I.D. chart | Chevy Tri Five Forum

The most well known Muncie transmissions are the M20(wide ratio), M21(close ratio), and the M22(rock crusher). Although not mentioned much, there was also an M23 transmission that was used, beginning in 1970. …

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1967

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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Muncie 4 Speed Transmissions

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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Rock Crusher identity

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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M22 Rock Crusher

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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Muncie M22 Rock Crusher First Gear

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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NEW Auto Gear Upgraded Ultra Case Muncie Heavy Duty M20 or M21 …

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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How to Rebuild a Muncie Four-Speed Transmission

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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The Story of the Mighty & Majestic Muncie 4 Speed …

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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How To Identify Chevy Four-Speed Transmissions

The M20 and M21 used a gearset with a more angled tooth design on each gear (left). The M22 Rock Crusher used a gearset that features less of an angled-tooth gearing (right). Images courtesy chevelles. The gear ratio of the Chevy four-speed transmission placed in any car was usually determined by the engine size and rearend axle ratio.

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muncie m21 vs m22

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 Camaro 4 Speed Muncie Transmission Conversion Kit

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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Muncie 4 Speed Transmissions And Rebuild Kits

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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