Found a good deal on the net for a new T.C. 4" lift w/ blocks in rear. (I know blocks /forums/images/graemlins/whistling.gif its my DD) Do I order the kit for a 87 3/4 ton truck that these axils came out of or do I need to call and talk to a sales tech about custom matching parts. Thus forgoing the slaes price. The setup is as follows 14 bolt S.F. rear and a 8 lug 10 bolt for the front. I am pretty sure all front springs are the same but I bet the rear 14 bolt axil dia. is bigger than the 1/2 ton 10 bolt.