Re: M-22 Vin stamp question?
 

Here is another one that is hard to read. Funny but they are easier to read when you take a pic of them.

This is just a M-20

S110732 P8A17 '68 Vette tranny unless I am wrong. this one does not have anything in front of the "S". Did they start this in later years?

Re: M-22 Vin stamp question?
 

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I was puzzled by the 11 in front of the "N". I could see the 1 next to it as 1971. The extra 1 is usually not on a trany vin stamping?

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That indicates it's a Chevy. 2 is Pontiac, etc. It's the VIN with digits 2-5 pulled out.