I had the same clunk noise at light throttle. I replaced the ujoints and that made no difference, i kinda suspected that there was some slack in the rear third member. So a few months ago i swapped my stock 4.10 units for a set of stock 4.88's. Now i have no clunk, only buttery smooth power transfer from the engine to the road.. <img src="/forums/images/graemlins/smile.gif" alt="" />