What pinion angle to use on 84 cougar? September 18, 2018, 06:36:41 PM I'm chasing a drive line vibration which I suspect could be caused by the pinion angle being off. I have the lower arms with the eccentric adjustable oval bushings. When I rebuilt the entire rear end suspension and added lowering springs, I may have not set the angle correctly. Any one have pinion angle specs for an 84 Cougar?