I remember seeing this leveling kit about 6 monts ago, but I can't find it now and I can't remember who made it.

I thought I remembered it being offered by Donahoe Racing or maybe Super Duty Headquarters.

Anyways, the difference was that it wasn't an additional part to add to the spring stack. It was an actual replacement spring cap. You had to compress the spring, remove the stock cap, and add the new one which was like 2" thicker. Does anyone remember seeing something like this or know who makes it?