Thanks for the info guys. Will stock up on a set of rear seals....the install went fine, will run one shock in the stock position and reverse the other to clear the offset disc. The stock diff was 62" wide and the PO had 8" rims with 3-1/2" backspacing, H78/15LT tires which were inside the rear fenders but not by much. Hopefully an 8" rim with 4" (centered)a 255 or 235/70/15 should work okay on the rear. Will bolt on the CPP front disc brackets tomorrow....hopefully, the 4" back space will clear the tie rod ends.
Once again, I appreciate your responses. Dave