About 6 weeks ago I purchased an 05 Screw FX4. It has no lift or leveling kit, but it does have 20's w/ 35's (Yes it rubs, & there is a lift planned for it, but that is how it was at the dealership). When I purchased it I installed new rear shocks as the old ones had the rubbers wore out. The problem is that when traveling down the highway at around 40 on curves or on the interstate at around 70, when I hit rough patches the rear of the truck wants to walk on me. I am not sure if it is because of it being to stiff or what. Any ideas on how to help this. My plan is to put an 8" rize on it within the next 4-5 months & I don't want it getting worse. Sorry for being long winded, just wanted to give some background.