For SRW Trucks Only: This ReadyLift 5" Rear Block Kit is designed for SRW (single rear wheel) trucks only. It will fit DRW trucks WITHOUT camping or overload springs, however we recommend a carrier bearing drop kit if you plan on going that route. To clarify, this kit will NOT fit DRW trucks with overload or camping rear springs.
For 1-Piece Driveshafts: this rear block kit was only designed to fit Super Dutys with one-piece driveshafts out of the box. Super Dutys with two-piece driveshafts will require carrier bearing modifications.