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I could use some help figuring out which muncie I have. On the passenger side of the case running palleral with the tranny is 3925660 then below that is U.S. patent # 3088336 running vertical with the case there are two numbers the top one looks like P0Mo7A and below tha is (looks like) 1oK107366. On the side cover is the # 3884685. I can tell you that the imput shaft has ten splines and the output shaft has 27. I would like to know what year it is and is it a 20,21,22 thanks for any input.
 

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Casting #s are 68 and 69 passenger car corvette, nova, chevelle, and camaro.
 

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The only way you can really tell what you have is to count teeth on the gears. Alot have had gear changes and such. I just got a Saginaw that had an input with no groves. It should have been a 2.85 low. Wrong it was a 3.11. I know that service Muncies were mismarked but this is the first Saginaw I have found that was.
 

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oger is right the 660 case was also used with M22
 

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I'm certainly no expert but here's how I read the numbers:

1. P0M07A is the transmission's assembly date code and original gear ratio(P=Muncie, 0=1970, M07=August 7, A=M20 2.52:1 wide ratio).

2. The 1oK107366 is a copy of the engine block stamping (1=Chevrolet, 0=1970, K=Kansas City?, 107366=Last 6 digits of VIN).

Looks to me like an M20 from an early production 1971 model year (non-Camaro) car.
 
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