M 21 Identification Help

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Old August 3rd, 2015, 07:14 PM
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M 21 Identification Help

Can someone help me identify the month/year of my trans?

Rick
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Old August 3rd, 2015, 07:16 PM
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Here are the pics
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Old August 3rd, 2015, 10:01 PM
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P0P12B= 4spd, 1970, September, 12, M21.
Tail: 3857584= 1966-1970 passenger speedo, 27 spline.
Side cover: 3952648= short boss bolt on type w/ TCS switch on 3-4.
So in theory your main case should be 3925660 or 3925661.

Just a guess but I'm sure others will let me know if I miscalculated.

Bill
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Old August 4th, 2015, 04:30 AM
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Originally Posted by wls559
P0P12B= 4spd, 1970, September, 12, M21.
Tail: 3857584= 1966-1970 passenger speedo, 27 spline.
Side cover: 3952648= short boss bolt on type w/ TCS switch on 3-4.
So in theory your main case should be 3925660 or 3925661.

Just a guess but I'm sure others will let me know if I miscalculated.

Bill
Thanks Bill

It is indeed a 3925661 main case
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Old August 4th, 2015, 09:18 AM
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Anytime.

Bill
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