i lifted my 79 6" less then a week ago and busted my 2nd u joint today. i looked at the joint and it appears that the needle bearings came out of one of the sleeves and is siiting at an angle instead of straight. it looks like the driveline is hitting the tranny bolt up spot, puching the joint out everytime they hit. i heard to solve this you have to grind both down so that they do not hit anymore. has anyone done this?