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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 same gear ratios as the legendary M21 but with a heavy duty gearset.
Well it was not designed so that you could go drag racing on Saturday night or impress girls in front of Burger King by doing massive hole shots. It was primarily designed as a road race transmission. The straighter angle of the gearset produced less heat and less end loading of the gear train. Combined with high impact alloy gears this 4 speed really pushed the limits of it’s aluminum case in drag race applications. Although the gears are not spur gears ( completely straight ) they still produced a fair amount of gear noise thus the “Rockcrusher” name. These 4 speeds sound like a blower drive whining.
When I owned a 1966 Corvette with the Rat Motor it came with a m22 transmission. After I broke two or three of them, which were all replace by used transmissions, I decided to rebuilt my own unit. So I got a hold of a set of low ratio gears, which were made for drag racing as opposed to road racing, my problem was solved.
Of course, once I solved my transmission breakage issues, I developed clutch breakage problems. That is an entire story in itself. Although the M-series transmissions are defunct, plenty of requests come in for used and rebuilt units. There are not any more used Muncie transmissions from that era available without getting lucky. You can buy Muncie transmissions from GotTransmissions.com with high quality American made gears and bearings with a single phone call. The number is 866-320-1182. We have them in stock at affordable prices with an excellent warranty. Call now for immediate delivery.