I have an 85 chevy 3/4 ton silverado with a 4in suspension lift, 3in body lift, 454, TH400trans, and a NP 208, 2. something ratioT-case. There's a 14 bolt 9 1/2 in the rear and i'm not sure whats in the front. I wanna swap in a corp 14 bolt in the rear and a 1 ton dana 60 in the front. I've read you have to get special u joints for this and i might have to move spring perches. I've also read that 15 in rims wont fit on the rear. what gears should i run with 35 in tires? i was thinking 4.56 front and rear would be okay? Is the NP 208 up to the challage or should i find a np205 or 203. any other info, suggestions would be greatly appreciated. thanks in advance.