I run 39 reds on 8 inch axles. IFS width rear with stock shafts, welded, 4:30 gear 4 cyl. third. 4 linked on coil springs. Front has low pinion 4 cyl. third, 4:30 gear, welded, O.G. bobby longs, trunion bearing eliminators, ARB studs in the knuckles and hubs, chromoly hub gears in factory locks, high steer, leaf sprung with a panhard for better steering. Stock 5.0L, C-4, dual yota cases with stock gears and upgraded input and output shafts. Ive been running this setup for 4 years now so far so good. Broke one rear ring and pinion this spring. I call that acceptable breakage, even the Rockwell guys break **** occasionally. I drive it how I feel like, mostly crawl but I aint scared of the gas pedal if needed. 110 inch W.B. approx. 3000 lbs.