Description: This is a Very Rareand Completely and Freshly Rebuilt M-22 Transmission with REAL GM Rock Crusher Gears for 1970 1971 and 1972 GM Vehicles including, Chevy, Corvette, Camaro, and Chevelle. These first came out in the 1970 Chevelle with the fine spline input and they were then released in the 1971 and 1972 Corvettes and other GM Cars. This has stamped into the M22 Main case: 1971 …
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Jul 29, 2016 · 1963-1966 production codes will start with the letter P and have four numbers, for example: P0421. 1. P represents the manufacturing plant, Muncie…More Details
If the helix angle is shallow (around 20 degrees), chances are you have the M22, or someone has upgraded to the M22 gears. M22 gears are also made of a higher-grade nickel alloy. The M20 and M21 cluster gears are cut at a 45-degree angle. The reduced …More Details
As mentioned previously, we know that the Muncie came with several ratios. Because main cases are often swapped rather than being repaired, the best way to determine if you have an M20, M21, or M22 is to simply look at the gears. Without removing the sidecover you can look at the input shaft and check for identification grooves cut into the splineMore Details
Aug 08, 2018 · 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 …More Details
Jun 13, 2017 · 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.com. The ratio of the four-speed transmission placed in any car was usually determined by the engine size and rearend axle ratioMore Details
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 bornMore Details
Muncie also had a second close-ratio transmission called an M22, which enthusiasts christened Rockcrusher; this was used in performance big-block engines and Corvettes and is a highly sought-after performance transmission today, and is the heavy-duty version of the 2.20 ratio M21 4-speed. The later-model 1971-74 units are more popular with drag racers, because the 27-spline output is stronger, and …More Details
The ST10 duplicated the current spline configuration, length, and shifter bolt patterns. The glory days of the 4-speed Muncie were over and BorgWarner once again was back in the saddle. The ST10’s production in GM vehicles was from 1974 to 1988. Because of production quality issues, no Corvettes were produced in 1983More Details
The M-22 has "straight cut" gears. Due to this, the box tends to be noiser (whines or howls almost like a blower, which is why it's called a "rock crusher") than other boxes. The M-21 has a higher pitch angle on its gear teeth. The close ratio gearboxs generally came with 3.73+ gear ratio'ed carsMore Details
Count the input shaft teeth to find out the make of the transmission. Input shafts differ in each GM transmission, so you can easily identify an M-22 "Rock Crusher by its input shaft count. Each transmission has different numbers of teeth. An M-22 "Rock Crusher" …More Details
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 itMore Details
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