is yours a dually?, i re-did the rear brakes, new wheel cylinders and ceramic pads it was a huge difference, you can lock all 6 tires up of you want to slam on it, for the spacers i used a 1inch(i think) closed end wrench and i used a 4by4 to break them loose, first i soaked them with pb blaster, prob. not the best method but it worked, because they dont make a 1inch socket that deep or else you would have to get it custom made, it would have been alot less of a hassle it the centurion company would have just used a normal 1ton dually rear instead of using a non-dually 1ton rear end end that way the wouldnt have to deal with the stud spacers