John's 4x4 in Billings sells Rough country lifts pretty reasonable. Or Safari Offroad sells BDS kits.
RC= soft & flexy, great for wheeiling, but their 4" kit will sag quickly & give you around 3" or so.
BDS= tough as hell, lifetime no hassle warranty, 3.5" kit gave me around 5" of lift & still has over 4" after it settled down. But it takes a long time to break them in & they're not very flexy when wheeling for the first couple of years.
Good luck choosing.