Put your slicks on the front otherwise your rear end will try to pass you since your front end has the drag of the 4x4 components. Run in 4 high so you may still be able to come to a half way respectable top end. Are you running a stall converter or a manual with a clutch? either way your (usually) weeker front axles are gonna take a beating, need to know what diffs, gears, tires, transfer case and tranny you are running to give you a good answer. also are you four linked front and rear?