How can I tell which Muncie transmission I'm looking at once I 've found one. Is there a casting number to identify M20 , M-21 or M-22 on the housing? Please advise as I am looking to purchase one soon, thanks.

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'85 Z28 Copper/ Gold, LG4 Auto
dual snorkel w/ ram air, Accel Cap Rotor and 8MM wires, Edelbrock Headers, Catco Cat, Flowmaster 80 series, 3:23 rear
American Racing Wheels.

 

Damn I wish ya would of posted this 2 days ago. I just did a clutch in my girlfriends 79 Z with the M21.

Kat

 

If the transmission was made between 1969 and 1974, the last character of the serial number is an A for an M20, a B for an M21, and a C for an M22.

 

thanks, that will help me out a lot in my search!

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'85 Z28 Copper/ Gold, LG4 Auto
dual snorkel w/ ram air, Accel Cap Rotor and 8MM wires, Edelbrock Headers, Catco Cat, Flowmaster 80 series, 3:23 rear
American Racing Wheels.