I just bought my truck, but the previous owner already had a 2.5" Ready lift leveling kit in the front. The truck is riding on 325/65/18" tires on some aftermarket 18x9" rims. With the truck parked on level concrete. The back is 1 1/2" lower in the front. My F250 has 2" blocks in the rear (stock) I was told the 350's have 4" blocks stock. So I ordered up a set of 4" taper blocks and new u-bolts. This should raise the rear back up 2". I am going to put these in today. I'll post up some pics when I am done. The blocks are the cast iron ones with the dowl hole and pin. They are made by Tuff Country Part# 79043