The flipkits move the axle on top of the leafs. You know; leaf over axle, or axle over leaf. The flip kits is not that hard to do yourself. i use a piece on metal (beam?) to work as a lowering block. and weld on supports for the original bracket that the leafs reast on.. On the top of the axle tube. If you do them yourself you also can adjust the pinion angle, making sure the pinion dont hit the bed under hard acceleration...
