Muncie M22 sounds I recorded with 4.10 gears. www.nastyz28.com/~copo/m22sounds.zip
Side view id.
Muncie (left) Saginaw (center) Borg Warner (right)
Shifter Info
2 piece for 1970 without a console
Chrome knob w/console White knob comes when you buy an aftermarket Hurst shifter
1971 Z28 without a console
M20 M21 M22 (missing 3rd gear) M22
M22/M21 cluster gears
Bronze Input Shaft bushing
Speedo cable adapter
Part # 3950352 (it has Stewart Warner and ratio .8241 stamped on it). Used on 1970-75 all ST (standard transmissions).
Levers & Control Rods Exploded view
Shifter adjustments Clutch pedal linkage and free play adjustment
Click here on how to ID a Muncie
The Muncie 4-speed transmission was used with many different GM models and engine combinations from 1963 through 1974. The main difference between the Muncie and the Borg-Warner is that the Muncie has a 7-bolt side cover and the Borg Warner has a 9-bolt side cover.
Muncie 4-speeds were produced in two different ratios wide ratio (M-20) and close-ratio (M-21). An extra heavy duty close-ratio version (M-22) was also offered on many of the big-block high-performance models. The choice of transmission was dictated by the engine size and rear-axle ratio. Axle ratios of 3.73 and lower (numerically higher) came with close-ratio transmissions, while axle ratios of 3.55 and higher (numerically lower) used wide-ratio transmissions. In addition, many GM high-performance engines came with M-22 Rock-Crusher in the 1970-73 years, however an early version of the M-22 was available as early as 1965 in Corvettes.
M-20 differs from M-21: Input shaft and Cluster gear
M-20 & M-21 differ from M-22: Input shaft, Cluster gear, First, Second, Third, Reverse idler gear. All other components interchange, with the exception of production upgrades and changes. For example, 1963-65 synchronizers, blocking rings, etc. do not interchange with 1966 and newer versions, and therefore the transmission must be stock or interchanged as a unit.
1970 Information
Casting: 3925660 Years: 1968 - 1970 Ratios: M20 2.52 1st , M21 2.20 1st, M22 2.20 1st
Casting: 3925661 Years: 1970 - 1974 Ratios: M20 2.52 1st , M21 2.20 1st, M22 2.20 1st
Ratios:
Year 1966-1974 Type: M20 Rings: Two Ratio: 2.52 / 1.88 / 1.46 / 1.00 / 3.11
Year
1963-1974
Type: M21
Rings: One
Ratio: 2.20 / 1.64 / 1.28 / 1.00 / 2.27
Year 1967-1974 Type: M22 Rings: None Ratio: 2.20 / 1.64 / 1.28 / 1.00 / 2.27
Example 10N553721 P0E08C
1 = Chevrolet (Camaro, Chevelle, Nova, Chevrolet, Corvette) 2 = Pontiac models
0 = 1970
N = Norwood
553721 = the last 6 digits of your VIN
P = Muncie
0 = 1970
E = May
08 = day
C = M22 (A=M20, B=M21)
