X2 for impact wrench and PB Blaster. My impact wrench is electric, and works great as well. It has paid for itself many times over. If you plan on doing much work on your YJ, it is a worthwhile investment. If this is just a one-time thing, see about renting one.I shouted many obscenities when I changed my windshield hinges. I found out the hard way the best way to do it is with an air impact. With a ratchet I stripped nearly all of them. I use a 1/2" Ingersoll and a 1/2 to 3/8 adapter. Works beautifully. No more shouting.