I have had good luck with the impacts that you strike with a hammer. Cheap and portable. As for the u-bolts, I just about always cut them off. My Bro- In Laws 94 YJ had the leaf spring bolts sieze inside the bushing, (Roger's XJ had the same problem). I ended up having to burn the rubber out with a torch. I did a 2" spacer lift in a friends TJ a few weeks ago, and even with it being a 2004 I had to cut the Front shocks out. Good Luck.