ROUGH COUNTRY | 6" Lift Kit | 17-22 Ford F-250 Super Duty / 17-22 Ford F-350 Super Duty | 55440 / 55430 / 55450

6" Lift Kit

Select the configuration below. Review the fitment notes and included components for your selected part number before ordering.

Available options

• OVLD / M1 Shocks — 55440
• Overloads — 55430
• OVLD / Vertex — 55450

Important fitment notes

Does NOT fit gas engine models. Does NOT fit dually models. Does NOT fit manual shift transfer cases Does NOT fit models with 3.5" rear axle tube ONLY fits models equipped with rear factory contact overload springs Does NOT work on models equipped with Tremor Factory Trim Package

OVLD / M1 Shocks — 55440

Take your truck to new heights with Rough Country's 6in Radius Arm Suspension Lift! This all-inclusive kit comes with everything you need for a total trasnformation of your truck. Run up to 37in tires while preserving the smooth, factory ride quality with this impressive upgrade. When changing a vehicle's suspension, the key to preserving ride quality is keeping the geometry of all suspension components as close to their factory angles as possible. Rough Country's new 6-inch Radius Arm Suspension Lift features a set of ultra-durable Radius Arms, precision fit to bolt right into the factory mounts for an easier install and a more factory-like angle. At 27lbs each, these beefy, upgraded Radius Arms dwarf stock equipment and feature durable durable rubber bushings for maximum vibration absorption. This kit includes a set of lifted coil springs and ultra-durable, fabricated anti-wrap rear blocks that prevent binding and axle wrap. Best of all, this kit comes with your choice of Rough Country’s N3, V2 Monotube, or Vertex Adjustable Reservoir shocks! Includes Rough Country’s Lifetime Replacement Warranty

Easy bolt-on installation Increased ground clearance Levels the front with the rear of the vehicle Radius arm drop brackets allow for properly set caster. Proper caster is crucial to maintaining factory handling and driveability. Includes application valved N3 series shock absorbers which offer the best in balanced performance for on and off-road use. Fabricated blocks are stronger and offer a longer lifespan than cast blocks. Specially designed anti-axle wrap rear blocks maintain stock ride quality while eliminating common lift block problem.

Overloads — 55430

Take your truck to new heights with Rough Country's 6in Radius Arm Suspension Lift! This all-inclusive kit comes with everything you need for a total trasnformation of your truck. Run up to 37in tires while preserving the smooth, factory ride quality with this impressive upgrade. When changing a vehicle's suspension, the key to preserving ride quality is keeping the geometry of all suspension components as close to their factory angles as possible. Rough Country's new 6-inch Radius Arm Suspension Lift features a set of ultra-durable Radius Arms, precision fit to bolt right into the factory mounts for an easier install and a more factory-like angle. At 27lbs each, these beefy, upgraded Radius Arms dwarf stock equipment and feature durable durable rubber bushings for maximum vibration absorption. This kit includes a set of lifted coil springs and ultra-durable, fabricated anti-wrap rear blocks that prevent binding and axle wrap. Best of all, this kit comes with your choice of Rough Country’s N3, V2 Monotube, or Vertex Adjustable Reservoir shocks! Includes Rough Country’s Lifetime Replacement Warranty

Easy bolt-on installation Increased ground clearance Levels the front with the rear of the vehicle Radius arm drop brackets allow for properly set caster. Proper caster is crucial to maintaining factory handling and driveability. Includes application valved N3 series shock absorbers which offer the best in balanced performance for on and off-road use. Fabricated blocks are stronger and offer a longer lifespan than cast blocks. Specially designed anti-axle wrap rear blocks maintain stock ride quality while eliminating common lift block problem.

OVLD / Vertex — 55450

Take your truck to new heights with Rough Country's 6in Radius Arm Suspension Lift! This all-inclusive kit comes with everything you need for a total trasnformation of your truck. Run up to 37in tires while preserving the smooth, factory ride quality with this impressive upgrade. When changing a vehicle's suspension, the key to preserving ride quality is keeping the geometry of all suspension components as close to their factory angles as possible. Rough Country's new 6-inch Radius Arm Suspension Lift features a set of ultra-durable Radius Arms, precision fit to bolt right into the factory mounts for an easier install and a more factory-like angle. At 27lbs each, these beefy, upgraded Radius Arms dwarf stock equipment and feature durable durable rubber bushings for maximum vibration absorption. This kit includes a set of lifted coil springs and ultra-durable, fabricated anti-wrap rear blocks that prevent binding and axle wrap. Best of all, this kit comes with your choice of Rough Country’s N3, V2 Monotube, or Vertex Adjustable Reservoir shocks! Includes Rough Country’s Lifetime Replacement Warranty

Easy bolt-on installation Increased ground clearance Levels the front with the rear of the vehicle Radius arm drop brackets allow for properly set caster. Proper caster is crucial to maintaining factory handling and driveability. Includes application valved N3 series shock absorbers which offer the best in balanced performance for on and off-road use. Fabricated blocks are stronger and offer a longer lifespan than cast blocks. Specially designed anti-axle wrap rear blocks maintain stock ride quality while eliminating common lift block problem.

Installation instructions

• 55440: Installation PDF
• 55430: Installation PDF
• 55450: Installation PDF