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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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Muncie 4-speed

The M22 transmission has a 20 degree helix angle on the gear set as opposed to a 45 degree angle found on the M20 and M21 and were made with a higher nickel alloy. 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.

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When was the M22 first called "rock crusher"?

The first time I heard the term "rock crusher" was in reference to the transmission in the 1967 L88 Corvette. Due to the low gear angle there is a fair amount of gear noise, really like a medium / heavy duty truck transmission. True enough the M22 did trickle out the door in 1965-67 and was buried in the option lists.

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M-22 "rock crusher"

it only sounds like a rock crusher as if you could actually put rocks in the transmission and crush them into gravel

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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.

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Muncie M22 4 Speed Transmission Rock Crusher Complete Package …

Find many great new & used options and get the best deals for Make OFFER - Muncie M22 4 Speed Transmission Rock Crusher Complete Package at the best online prices at eBay! Free shipping for many products!

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Muncie Parts

In 1965, GM introduced an even more robust version of the Muncie transmission, known as the M22 or "Rock Crusher." This transmission, with its distinctive whine, became synonymous with …

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Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4 …

STRONGEST Direct Replacement M22 With NEW Muncie AUTO GEAR ULTRA CASE With The Strongest M22z ULTRAWIDE RATIO 4 SPEED TRANSMISSION. A GREAT HEAVY DUTY ROCKCRUSHER FOR YOUR CAMARO, NOVA, CHEVELLE, CORVETTE, GTO,442. THE MAIN CASE IS THE STRONGEST MADE with fill and drain plugs. C355 Forged Aluminum Mid …

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NEW Auto Gear Upgraded Ultra Case Muncie HD M22 4-Speed Rock-Crusher

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. 10 OR 26 spline input and large 27 OR 32 spline output shaft. C355 Forged Aluminum Mid-Plate. Super Tail. AG Roller Side Cover. A…

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The Rarest Muscle Car Transmission In The '60s

Among models from the 60s, the M22 Rock Crusher manual transmission can be found in models such as the C3 Chevrolet Corvette with the 435 hp L71 427 V8, 425 hp L72 427 V8, and the 500 hp L88 427 ...

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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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GM Muncie 4-Speed Decoding

M-22 "Rock Crusher" Identification. The M-22 close-ratio transmission is easily identified internally from the M-20 and M-21 versions by the angle of the gear teeth. The M-22 was only produced in a close-ratio version, so it will not appear on models with high rear-axle ratios (3.55 or lower numerically) unless someone has changed it.

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M-22 "rock crusher"

He mentioned he had a M22 rock crusher in his car, and how rare it was because only a few of the M22's were "Rock Crushers". I am by far an expert, but I have never heard of this before. ... If the transmission is in the car, and there is NOT a part number tag attached to one of the side cover bolts, NO, there is no way to tell if it is an M20 ...

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GENERAL MOTORS MUNCIE 4-SPEED MANUAL …

4-SPEED MANUAL TRANSMISSION ASSEMBLIES, GEARS & PARTS APPLICATIONS: GENERAL MOTORS 1963-1974 GENERAL MOTORS (HIGH PERFORMANCE) AUTO GEAR EQUIPMENT ... L26-s36T: M22 'Rock Crusher' (1971-74) 3978761 WT297-16Z NOTE: these (3) gears used with 26 spline clutch. B2-2 Maindrive Oil Slinger all 3925692 3925762

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M-22 Rock Crusher Four Speed Transmission

Muncie M-22 Rock Crusher Four Speed Transmission - RARE Drivers Side Speedo (#1) See all feedback. Product ratings and reviews. Learn more. 4.8. 11 product ratings. 5. 10 users rated this 5 out of 5 …

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NEW Muncie M22 SUPER ROCK CRUSHER 4 speed …

Transmission Yokes: M5R1 / M5R2: Clutch Packs: GEARBOX TEE SHIRT: Miscellaneous: Discontinued, Used, Sale. 1st gear: Shipping: Contacts: Instructional Videos: MT82: Muncie Parts > NEW Muncie M22 SUPER ROCK CRUSHER 4 speed $2899.00. NEW Muncie M22 SUPER ROCK CRUSHER 4 speed $2899.00. View Images. Price: No Price: Sale Price: No Price:

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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. ... M21W and never tell anyone it is the "W" gearset, they'll never know. I have tested many customers and they swear their transmission was a close ratio ...

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The Story of the Mighty & Majestic Muncie 4 …

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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'69 Z28 Transmission

I have a '69 Z28 with a M-21 transmission, and I was told that it was the correct 4speed that came in the car from the factory. Is the M-21 the same as what they call a Rock Crusher? Is the VIN# located on the transmission to verify it's correct and if so where's it located? Thanks, Donnie.

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Muncie 4 Speed Transmissions And Rebuild Kits

John DiLauro on Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4-speed. Perfect Performance with 2.73 to 3.42 Rear End Gears. SALE EXTENDED!!! Garry Brown on Super Pro Road/Race Muncie Upgraded Ultra Case M22 …

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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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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 …

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Chevy Transmissions: Muncie 4 Speed M22 …

Chevy Transmissions: Muncie M22 "Rock Crusher 4 Speeds were made From 1965 TO 1974: The most popular transmission of it's time for high performance cars built for Chevrolet and all performance oriented G.M cars. They have the …

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The Muncie 4 Speed Transmission Taught A Generation Of

In the early 1960s, GM was looking to move away from the four-speed manual transmissions it had been purchasing from BorgWarner and bring production in-house. The twist was the four-speed gearbox found in the first two generations of the Chevrolet Corvette—the BorgWarner T10—had in fact been built using plans …See more on drivingline

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