Audi question... there's a needle bearing inside the hub assembly that the axle shaft rides on. Did you check yours to make sure they are good?

When I did all this work to my truck I didnt even know those little guys existed and I had to reassemble everything, wait for parts from rock auto, and do it twice cause one was bad.

88 Montero, StarQuest turbo, Kormex 5speed +tuff-pan w/phoenix f. stage2 clutch, 4in lift+33' tires, 4.875 lsd, short-throw shifter, Aisin hubs, SR big brakes, gen2 uca's, elantra alt, and so much more... 16g turbo w/hardpipes + 4.90 locking disk-brake axle soon (maybe lsd or aussie front??)