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M22 or M21 what's the diff?

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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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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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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Muncie Parts

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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Muncie M21 4 Speed Transmission Rock Crusher Close Ratio …

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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Is this a real M22 Rock Crusher?

Is this a real M22 Rock Crusher? ... M21, and M22 Muncies and the 1970 M22 had. A M20 with the 32 spline output and 26 spline input is a desireable Muncie as it was stronger than earlier Muncie M20s. Be aware that they are also 3/4 …

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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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Muncie M22 Rock Crusher

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. 5 watchers.

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M22 4 speed rock crusher

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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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 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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Muncie 4-Speed: The Complete History

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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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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M-22 "rock crusher" | Page 2

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

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How to Identify a M22 Rock Crusher

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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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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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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The Rarest Muscle Car Transmission In The '60s

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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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 M21 vs M22 | Powerboat Forums at SpeedWake

My dad runs a M22 rock crusher in his 66 Vette. The originals were substantially stronger than the M21, but the case was a weak point. M22's are now available with beefed up cases and they are very strong!! I know that is what my dad is running and I can find out where he purchased his. The M22's make a cool whine sound due to the straight cut ...

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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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M21 M22 4 Speed Muncie Manual Transmission

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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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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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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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 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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When was the M22 first called "rock crusher"?

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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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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Muncie Calendar Date Codes — D.M.E. Transmissions

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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