[crazy longhorn]

A 4" drop spring at the rear would probably be the slickest way to go, & still keep enough clearance for the extra load when hauling. If you need a little more, you can add shackles as already mentioned.......if you go much more than 5" drop, you will need to add a notch to the frame. the amount of drop also depends on the thickness of the leaf stack when doing an axle flip. In my case on the longhorn, I did a flip, & also removed the flat helper,& a 2 or3 bottom leafs& figured about a 6 1/2 " drop. That was a little much, as I am not running a notch in the frame. Next step was to remove the spring hangers, & move them down on the frame 1 1/4" to give right at a 5" drop.......with no c notch,& no bump stops, I have right 2 3/4" clearance between the frame & axle tubes. I havent ever seen the axle bottom out, but I dont do any hauling, & those Longhorn springs are still pretty firm with only 4 leafs left in the stack. Good luck.....crazyL