[dsraven]

you could mock up a 4" drop using wood blocking to see what you like and also what room that will leave you above the axle on your unit. you need at least 3" above the axle so the suspension doesn't bottom out over speed bumps etc. I recommend using one of those beehive suspension snubbers found on newer vehicle, like those found on a newer chevy truck. look up GM P/N 15712438 it's rear bump stops off a '99-'06 Silverado 1500