I have got an 86 GMC that someone put a 12 bolt into. I have brand new 35's for the truck and i might even go with 36's, i am running 4 inch suspension lift. Have any of you guys had problems with the 12 bolts, This one is going to get a eaton posi unit, new axles, bearings, and 4.10 gears. Someone told me that pinon bearings get messed up in the 12 bolt when you have a suspension lift on them.
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