The sure grip unit is a brand new Auburn Gear unit (cone I believe). Here is what I did, I put the left axle in, seating it with a hammer and tightening down all the axle nuts. There is end play on this side. On the right side I backed the adjuster out all the way and put the axle in seating it with a couple whacks of a hammer. I then Tightened 4 of the 5 nuts. And following shelbydoggs other posts I should then be able to move the adjuster to adjust endplay. This is were I have my problem, as soon as I tighten 4 of the bolts all end play is gone and I cant turn the adjuster at all.