This may be sort of a newb thing to ask - I have 4" springs and a zero rate for the front, shackle flip rear (not ORD, but the other guy that went out of business) Soon to be going one ton. My question is this - - what length shock would I go with? Ones for a six inch lift? more than that? anyone w/ similar setups? brand names and part #'s would be great. thanks for your help.