How to Tell the Difference Between a 4 Speed Muncie & a Saginaw Transmissionby Joe Friedman
Muncie and Saginaw were two production facilities for General Motors vehicles for many years. In the 1960s and 1970s, both factories produced four-speed transmissions for some otherwise identical cars. Car enthusiasts care a great deal about the specifics of their particular classic vehicle, so knowing whether their particular Chevy Camaro has a Muncie or Saginaw transmission is very important to them. Other than slightly different gear ratios, there are a handful of ways to tell Muncie and Saginaw transmissions apart merely by visual inspection.
Locate the reverse lever on the transmission. On the Muncie, it's mounted in the extension housing. On a Saginaw, it's mounted in the side cover.
Look at the construction of the transmission. The Muncie is aluminum-case, but the Saginaw transmission is cast-iron-case.
Look at the identification number stamped on the transmission. The last five numbers are sequential serial numbers, and each plant only produced a specific block of them. Muncie produced serial numbers 35000 through 44999. Saginaw's serial numbers all end between 25000 and 34999.