I've been looking for the answer since Sunday morning and I'm having a hell of a time with this one as my problem is different from most. I just put on the Rough Country 2" leveling springs. I also put on new Bilstein 5100's. I was only an 1" lower front to rear. I got 3.5" of lift out of the springs. Now here's the problem (besides the need for rear blocks). I can go 80 MPH down the interstate no problem, but if I hit only certain bumps I get this shimmy I would relate to wheel hop when your stuck. I feel it in the steering wheel, but it still drives straight. It is not hard to control and there is no loss of steering. I have to slow down to less than 30 MPH to make it stop. It will do it at speeds of greater than 55 but not at speeds slower. The springs are way stiffer, have more coils, and are made of a thicker stock steel. My truck does NOT do this with the plow installed. Rough Country, of course, says it's the alignment. How would I have changed the caster or camber?! The axle retains it's position as far as caster is concerned correct? Camber is set with the inner C's, so that should be good. I did not have it aligned. It goes in for that tomorrow. I'm having them print me out a page of how far off it was so I have some room to argue with them. My truck is an '08 with 30K on the dial. I doubt that my ball joints, tie rods, or any busing is bad. I have looked the front over for any loose or misaligned part and have found none. My shocks did get fully extended when we were installing them. The wrap around the shock came off. Would that have done anything to the Bilsteins? I know this is long winded. I just don't know what it is due to the fact id does not affect my steering.

 

Did your lift kit come with new spindles? If not the angles will be off. You're definately going to need an alignment but i would still recommend doing the lift spindles on your truck... If you search for lift kit and spindles or something along those lines, you'll see other people have had similar problems as you do.

 

solid front axle. just leveling springs not a kit.