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Decoding/Numbers / muncie/saginaw 3spd date stamp and casting numbers help

« on: June 19, 2012, 08:28:02 PM »

its looks like muncie or saginaw,  i know its a 3 speed. main casing # 3852882   gm1 the other main casing # gm8 395265  and the number 8 or 6 not sure the serial tag on one the side plate bolt 3968081 and the date stamp is M1k31A this number is clear as day was under a ton grease. I cant find nothing on this trans.this transmission has my curiosity peaked it would be nice to know what this transmission is. thanks for any help