Quote:
Originally Posted by 1969KatyTX
The code on mine is HC1217W on the axle tube with the casing code of NF3890838 on the front of the pumpkin... can anyone give me some insight to what I have? Is there an easy why to determine the spline number with out pulling the axles?
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from the factory, your rear was a 3.73 positraction. If it is a '65 or later GM 12bolt truck rear end, the axles should be 30 spline. If you are unsure, the only other way to check is to pull out an axle and check it...