I think the original question was in regard to rear end swap. Does this truck have the original torque tube setup? I assume so?
The 55-64 1/2 ton truck rear is still super common and you can find one for less than $100, probably closer to free. It is a super easy swap. Might need someone to weld on some spring perches for you…that’s about it.
The rear under my truck is one of these that was literally free. I found out, during install, mine had a 3.38 gear set in it. 99% of them are going to be 3.90. 3.90 with 30 inch tires is a very highway drive-able combo.
