I have a 90 burb that has a wierd shake when I first take off, it doesnt do it every time I take off, which makes it hard to nail down. It feels like what I heard of as axel wrap, it feels like wheel hop in my old mustang when I spun the wheels. the pre owner said the tranny was built a little while before I got it so it was not the tranny. I just put a 6 in lift on and it made no diffarence, which brings me to my next question, I put a rough country lift on springs front, helper spring and 4in block back. The pass side rear sits 1 and3\4 inch lower than the driver rear. I checked to make sure every thing was the same. Do you think the springs are no good. or should I check something else. the rear has the usual sag, how much have smoe of you added to the rear to level it out?