Alright, I just installed the Bilstein 5100s and my truck still rocks back and forth, while driving on freeways especially. It feels like I'm rockin and rollin up and down, like I'm on the bow of a boat. It damn near throws me out of the seat at 75mph. It doesn't happen all the time, just certain stretches of highway. I've driven on the same stretches of freeway in different cars without this problem, so I know it's my setup. I replaced the POS fabtech shocks with the bilsteins hoping to clear up this problem. Unfortunately, the rockin is still there. Overall the bilstein ride is better but I still have that problem. Any ideas? I've got 5 inch blocks in back, could that be doing it? Do I need new leafs? My torsion bars are cranked about 1/2 and inch. I still have about 3/4" of thread left on the stock keys. Any help would be appreciated and thanks ahead of time.