SUBFRAME BOX FOUR

The Rancho RS6554B-4 suspension system is a 4-inch lift kit for 2011-2022 Chevrolet Silverado 2500HD and GMC Sierra 2500HD. It includes torsion bar relocation brackets for maximum structural integrity without modifying the vehicle’s steering geometry. The system allows for up to 35-inch tires and features a one-piece, re-inforced subframe made from high-strength, low-alloy steel. It also includes tubular aft braces and Rancho CNC-machined, extended cast steering knuckles for superior strength, reliability, and improved ride and handling. This kit requires no drivetrain or exhaust modifications, allows for the re-use of stock wheels, and maintains factory rack and pinion alignment specifications. It is compatible with both gas and diesel truck models, 4WD and RWD.