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Have a couple of questions. Never messed with swapping out a gear set up and will probably let a reputable shop do this. But was wondering about. I have a spooled 4.56 set up right now 8.75 rear end. I am looking to swap them out for a for 3.91 or 3.73. My question can I reuse the spool from...

Have a question on the numbers on the pan rail on a 904 transmission. The numbers on the transmission are 34 0079A 3220 6418 727 transmissions start with a PK shouldn't the 904 start like that? Or do they use the 34 instead at the beginning? Thanks for any information. Rob