I have a slip type driveshaft in the rear bolted to a 8.25. I have a rustys 3" AAL. When I come to a stop or take off, its like my suspension is loading up, or letting go, it makes a knocking. Is that because my springs are weak, because of AAL's. I dont have bad ujoints. I dont have excessive play in the rear. 80,000 miles on it. New trans mount. If yall have any input I would appreciate it. Thanks