I had 38/15.50/15 richard Cepek FC Kevlars on my 81 longbed. It would rub on the frame in the rear if I would flex. It would also rub on the front leaf springs if I would turn too far. So what I did was backed out those bolts in the front so it wont turn as far. It would rub on the front if you would flex it on the body if your axle isnt moved forward.
PS My avatar pic is my truck with the 38s on it. I now have 37" MT/Rs
