So i recently changed the fluid in my rear end (85-145 full synthetic) i checked around and was told that 4oz. of friction modifier was the proper amount to add to my rear dif. and i did so, problem is i am now getting a lot of wobble out of the rear end (this started about 3-4 days after changing fluid) and honestly feels like something is a little loose, the only other thing i could think of is the pinion bearings, and honestly they aren't that sloppy....any ideas, did i use too much modifier?all wheel lugs are torqued, tolerances were tight in the dif. when i had it apart last week (minus the slight play in the pinion but it was like that and didn't cause a wobble prior to this) drum brakes are good, wheel bearings are good, no play in 'em.....:shrug:thanks guys, Matt.