I replaced a bad 10 bolt in my 88 burb with a 12 bolt I got from a guy who used it on his blazer. Bolted up fine shocks mounts are correct problem is the driveshaft U joint hook up. The flange won't accept the burb rear U joint. I am hoping not to have to swap flanges. The U joint almost fits but the E clips hits keeping the U joint from seating in the flange. If the existing U joint did not have the E clips, it would fit perfectly. Another U joint would have to have (I guess) two different sizes, one to fit the drive shaft (same as existing) and the flange side to be approx 1/8 inch wider on each side (total 1/4 inch). Is there a speical U joint which will solve this problem and does anyone have the part number for it? Any help greatly appreciated.