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Do you know how to tell the difference between a Saginaw, a T10, and a Muncie four-speed? The easiest way is by knowing the construction of each unit, and the differences are obvious. If the case and side cover are made of cast iron, that would make it a Saginaw transmission.
1964, 1965 and some early 1966 models are easy to identify because of two unique features. These versions are readily spotted by their ball and trunion U-joint flanges and small speedometer pinion adapter.
* MUNCIE Shaft Identification The above Muncie 4 speed transmissions can be distinguished from the style of the transmission arm attachment. Pre ‘69 Muncie’s use a stud & nut at the indicated attachement point, while ‘69 and later Muncie’s use a bolt as illustrated on the right. MUNCIE M-22 (453) G.M. 7 bolt side cover 1970, 454 Chevelle
1964 to 1968 Muncie 4-speed transmissions can be identified from later models by the way the transmission arms attach. Early Muncie side covers had a stud and the shift arm attached with a nut on the stud while the 1969 and later model side covers had a hole and the shift arms attached with a bolt.
Most of the Muncie four-speed transmissions will have a casting date code on the main case, extension housings, and side cover.
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). (The M does not stand for “Muncie.”) Typically, when you ordered a GM car you had standard options and accessories installed.
Here are reference images of the three most common 4-speed manual transmissions: Muncie, Saginaw, and Borg-Warner. The popular Muncie 4-speed was available in three versions: Muncie M20 - Wide ratio