Muncie also had a second close-ratio transmission designated M22 and often referred to as the "rock-crusher," which was used behind the highest-performance engines and in Corvettes, the M22 is a highly sought-after performance transmission. It is the heavy-duty version of the 2.20:1 ratio M21 four-speed.

Description Part Number. Rebuilt Transmission 1966-1974 M21 27 Spline MTGM016. Rebuilt Transmission M22 1966-1974 Rock Crusher MTGM038 

What transmission is the rock crusher? The 2.56:1 ratio is commonly referred to as the M20. Muncie also had a second close-ratio transmission designated M22 and often referred to as the "rock-crusher," which was used behind the highest-performance engines and in Corvettes, the M22 is a highly sought-after performance transmission.

Muncie Transmission ID and Ratio Guide. Series: Gear Ratio 1st, 2nd, 3rd, 4th: Spline Input: Grooves Input: Cluster Pin : Tooth Count Input: Tooth Count 4th Cluster: Output Spline: M-20 wide ratio 63-65 M-20 wide ratio 66-70 . M-20 wide ratio 71-74 . M-21 close ratio 63-65 .

Yesterday, the finest synchronizer rings for your 'Muncie' four-speed were made in Wuhan, China. (2) uses the legendary M22 'Rock Crusher' gear geometry

muncie 4 speed rock crusher gear ratio. GM was phasing out the use of the Borg-Warner T-10 in 1963, and the Muncie 2.56:1 ratio becamestandard equipment for four-speed applications in the 1964 Chevelle, Nova and Olds F-85/Cutlass. The early Muncie units built between 1963-'65 had a 7/8-inch input shaft and are not the best transmissions to use

Muncie 4 Speed Hot Rod Forum. Aug 14, M-37 Super Muncie or rock crusher Several ratios available, large input shaft 1 14, like Hemi 4-speed and big Top Loader, spur-cut 1st gear increased load shock capability, makes a horrid whine , thus the nickname and large output shaft.

I replace an purchased M22 gearset with an Autogear M22Z set. Comparisons of builds and gear ratios explained. I have some dissassembly highlights in t

Muncie M22 Gear Set 2.20 Ratio Rock Crusher 10 Spline Input Fits M20 M21 4 Speed · PicClick Insights - Muncie M22 Gear Set 2.20 Ratio Rock Crusher 10 Spline 

The M20 and M21 cluster gears are cut at a 45-degree angle. The reduced gear angle of the M22 created. M22 gears are also made of a higher-grade nickel alloy. (hence the name rock-crusher). Contents show

New Muncie M22 2.20 close ratio or 2.52 wide ratio Rockcrusher gear set is availabe with either a 10 or 26 spline input. Close ratio 26 spline gear sets available in Italian or Korean made. You must select whether you need a wide or close ratio & which input spline count, 10 or 26. Fits all Muncie applications with 1" countershaft pin, 1966-74.