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Just three types of Muncie 4-speeds are available based on the RPO (regular production option) code used when a car was ordered: the M20 (standard wide-ratio), M21 (close-ratio), and M22 (heavy-duty close-ratio).
Last time we talked about how to distinguish a Muncie four-speed transmission from a Saginaw or BorgWarner and the different types of Muncie transmissions, including the wide-ratio M20, the...
M20 input = 21 teeth. This is on a 66 to 74 model year Muncie. Otherwise you can tell a difference by spinning the input while in first gear, and counting the revolutions of the input with respect to the output. The M20 will have 2.52 rotations of the input per one rotation of the output.
Muncie M20/M21/M22 Main Case Identification. GM Casting Number. Year(s) Produced. Description. 3831704. 1963. Patent Pending, 7/8-inch Countershaft Bore Aluminum Front Bearing Retainer Small Input ...
The M20 and M21 transmissions produced from 1963-’74 are easy to identify in both wide- and close-ratio units. The M22 to come later in 1967-’74 is also a close-ratio unit, but much stronger than the M21, with a higher torque capacity.
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.
Muncie four-speeds were produced in two different ratios: the wide ratio (M20) and the close-ratio (M21). There also was a second, heavy-duty close-ratio version: the "Rock Crusher" (M22) that...