I've had my YJ for 3 now. PO had a RC 4" lift put in but didn't do the TC drop. I've got driveline vibrations when cruising at almost any speed and the seals are going bad on the TC and the rear diff yoke seal so I assuming it is because of the angle of the driveshaft not being correct without the drop. I went to do a temporary drop with some washers and new bolts today then realized why the PO didn't do the drop. Looks like on the drivers side there is one bolt that was sheared off at the head, one bolt that whatever it threads into is busted/rusted out so it is just flopping around stuck in the middle hole and then they added their own 15mm bolts to tighten it back up. Since I only had the replacement bolts for the 1/2" stock bolts I stopped at this point.
What needs to be done to get this fixed? I don't weld so if any welding is involved I'd have to take it to a shop.