I just purchased a 92 SR5, only 150000 miles, that had helper springs installed on the rear. The springs raised the rear about 4+ inches. This solved the drooping rearend that the previous owner did not like, but the U-Joints on the front end of the rear driveshaft went out. While repairing everything, I noticed that the angle of the driveline was a bit steep. Maybe had something to do with the driveline angle. When, at what angle does the transmission need adjusted to function correctly and not wear out u-Joints? Any suggestions on a fix?