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Originally Posted by Kateye_Kenzie
Just spoke with the boss... there are none of those numbers on the axle and that's why he only gave me the casting number... And the pinion is broke out of it and missing so I can't rely on that either. Does anyone know what was in these trucks out of factory? I'm talking to the GM Heritage Center right now but they take weeks to reply...
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Hello, not to challenge “the Boss” but, the rear axle stamp numbers are different from the casting numbers, are easy to miss if covered in road dirt & grime. They may be on the axle tube itself. Might find them with a closer look, wire brush/degreaser. See attached photo for example. It is possible they might not be on the axle, or unreadable, but if he can find them it will be way easier to determine the rearend