Dragbag assist?
http://www.jegs.com/i/Air%20Lift/022/60897/10002/-1
Now when you say too much preload, would this be in the LCA location? Because with the stock 10 bolt & no LCA relo brackets, it still had wheel hop pretty bad, now with the 9" & the bars in the middle hole its still there, but traction is great, only coming out of the water box as its starting to hook it chatters. Running any kind of well hooking tire it has a fit at the track, on the street its hardly even there.

