I put on the KORE HD Leveling Kit. mine came with the HD Springs, 5100 Bilstein Shocks, and blocks for the front stabalizer bar. I am also running Bilstein 5100's in the rear and Firestone Ride Rites. The reason I decided to go to the more expensive kit was because it comes with all the stuff to do the job right. The kit generally articulates the same as the front end of the Powerwagon. There are others that make kits - Lorentz makes a nice kit too. Too many guys seem to get into the Death Wobble that use only the spacers without changing shocks and springs and dropping the front stabalizer bar. I am very satisfied with the KORE Kit. It took me about 4 hours to put it on.
CD