Originally Posted by Skillz_B

Did you sand the diff rings to make sure thy are flat, also when building the slipper it helps to scuff off the sheen on the slipper pads ( I use an emery board ). You might want to back off the diff screw and work the diff by hand, and tighten 1/8 of a turn till you get back to the proper tension on the diff, working the tires by hand for at least a few minutes inbetween apdjustments. I dont care for the black AE grease, I used Mobile 1 synthetic grease instead, between that and breaking in my diff by hand, mine is super smooth (better than any ball diff I have built before)