fitted 235 85 muds on modulars to my ex military 110 & since then @ 50 mph + it suffers "torque steer" ie. darts to right offpower & to left onpower but tracks true on steady gas .All steering joints/swivels/tracking good.....any suggestions? or experience? Mick110
Checked your radius arm bushes?
Get a pry bar between the axle and the arm and look for any movement - especially side to side. If they are worn it may be enough to affect steering as the axle moves relative to the chassis.