Originally posted by chevyman
ok I have identifyed that it is a 8.5" now I looked on the ring gear and found these numbers exactly like the one below what do they mean will they tell me the gearing

1 GM 398A828 13 40 1 81
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the (A) could be a 7 or a 4 couldent really see it very well
thanks chris
I'm thinking thats when they were made from the letter and the numbers. I could be wrong though