on a stock 60  i ran 38 tsl sxs with 513 gearing arb front on a full size with duel cases and 4.7 gear kept braking 30 spline axles  up graded to 35 s splines work fine. changed tires to iroks 42 inchers started braking 35 spline. changed to chrome molys 35 s have'nt broke yet . you will need to go with a rock ram . 4 the steering  cross over just was'nt helping.