I just did them on my truck, you have to remove the springs, remove the bottom plates, use c-clamps to hold the pack together, then take out that center pin. Use vise grips to hold the head. After that the slapper bar should come off. Then install the new allen cap bolt. After that uses chisel or wedge to open up the spring eye. Drill out the rubber in the bushing and then use a piece of pipe to hammer out the old bushing shell. Then with some wooden blocks in a vise press in the aluminum bushings. Make sure you freeze these over night and coat them with the silver never seize. Re-install and tighten all the leaf spring bolts with the truck on the ground. I then installed the bars by thread each eye all the way in and backing them off the same amount on each end until they fit.( that's with the poly roller touching the spring) Now put a mark on the tube and turn it 1-1/2 turns from touching. This is what I did and had zero problems with. The hardest part is getting those old bushings out. Second hardest is pressing the new bushings in because the spring eye tightens up after you take the wedge out.
