Uncle Ralphy

There was a 1957 Corvette 3-speed transmission for sale on e-bay. It has an assembly code beginning with "M". The information I have found indicates that "M" stands for Muncie and that these transmissions were for use in passenger cars and commercial applications. I understand that the Corvette 3-speed transmissions were made in Saginaw and the code begins with "S".
The transmission for sale has all the correct casting numbers to fit a 1957 corvette, and a side mounted shifter as well. The seller stated that it came from a 1957 Corvette. Was Muncie operating in 1956/57?

Can anyone enlighten me on the "M"??

Al

silver67

the casting number should be 3845122. What does the casting date show? Should be a S. three speed. Muncie was a P. Sure not a W? (Warner 4-speed)

Uncle Ralphy

This is a 3-speed transmission with the following numbers:

Maincase number: 3845122
Casting Date: H2356
Sidecover casting number 3731911
Tailshaft Casting Number 3722846

Assembly date stamp: M918

Chevy By the Numbers says S=Saginaw, M= Muncie (Cars & Trucks)

Uncle Ralphy

Thinking about this, it's probably a Corvette tailpiece that was bolted to a passenger car maincase. Corvettes and cars apparently had the same maincase casting number.

Al

silver67

My corvette by the numbers show a 3737450 tailhousing. With a note that very early 57's had a 3722946 tailhousing.

Uncle Ralphy

My mistake. Typo. should have written '946'.