I had a Eaton 19557 8.5 posi unit, GM 8.5-342 gear set, GM8.5 HD complete install kit w/races and bearings. Install all new internal parts including new bearings, races,seals, gaskets, new Eaton Posi3.42 ring and pinion gears. Setup ring and pinion gears. set up ring and pinion to proper pinion depth and correct backlash. set up and check for proper gear mesh pattern. Reassemble complete with axles,backing plates etc. 80/90 gear lube MOT-MGPLSF friction modifier. So why does it wine when I let off the gas?