6-Inch Lift Kit with Vertex Shocks for 2017–2022 Ford Super Duty 4WD
- Fits 2017–2022 Ford F-250 and F-350 Super Duty 4WD, XL through Limited — check the exclusions before ordering
- Does not fit gas engine, dually, or Tremor Factory Trim Package models, manual shift transfer cases, 3.5-inch rear axle tubes, or rear factory contact overload
- Kit includes Vertex 2.5 front and rear shocks, 6-inch coils, radius arm drop and upgrade components, and a transfer case clocking kit
- Fabricated rear blocks with a 4.5-inch block U-bolt kit; radius arm drop brackets set proper caster
- Downloadable installation guide available
The Trail Fortress check
Will it fit your truck?
✓ Fits
✕ Does not fit
- Gas engine models
- Dually models
- Manual shift transfer cases Does NOT fit models with 3.5" rear axle tube Does NOT fit models equipped with rear factory contact overload springs Does NOT work on models equipped with Tremor Factory Trim Package
About this kit
6-Inch Lift Kit with Vertex Shocks, fitment-checked
Rough Country 55850 is a 6-inch lift kit for the 2017–2022 Ford F-250 and F-350 Super Duty 4WD, built around Vertex 2.5 front and rear shocks, a radius arm drop kit, coils, fabricated rear blocks with U-bolts, and a transfer case clocking kit. It does not fit gas engine, dually, or Tremor Factory Trim Package trucks, manual shift transfer cases, trucks with a 3.5-inch rear axle tube, or trucks with rear factory contact overload springs.
This 6-inch lift kit for the 2017–2022 Ford Super Duty 4WD covers F-250 and F-350 trims from XL through Limited, including King Ranch, Lariat, Platinum, and XLT. Radius arm drop brackets reset caster so steering feel stays close to factory, and the rear uses fabricated anti-axle-wrap blocks with a 4.5-inch block U-bolt kit rather than cast pieces. Vertex 2.5 shocks handle damping at both ends. Work through the exclusion list first — engine, axle tube, transfer case, and overload spring qualifiers all matter here — then use the downloadable Rough Country installation guide to plan the job.
What’s in the box
Kit contents
- 1× 6 Inch Coil Box 9296
- 1× 4.5 In Block U-Bolt Kit No Overloads 1563BOX4
- 1× Radius Arm Kit Box 512BOX1
- 1× Univ. 3 4 X 4 1 X 1 2in U-Bolt Kit 7673
- 1× Transfer Case Clocking Kit 55003
- 2× Vertex 2.5 FR 6 In 685754
- 2× Vertex 2.5 RR 6 In 695805
- 1× Radius Arm Upgrade Box 53600991A
- 1× Radius Arm Upgrade Box 53600992A
Rough Country shares subassemblies across kits, so individual package labels can carry broader application ranges. The complete 55850 kit fits the vehicles shown in the fitment section above.
Specifications
Specs
| Brand | Rough Country |
| Part number | 55850 |
| UPC / GTIN | 00843030190200 |
| Lift height | 6 in |
| Shock package | Vertex series |
| Shipping weight | 352.41 lb |
| Country of origin | TH |
| Category | Suspension & Lift Kits › Lift Kits |
| Installation guide | Downloadable PDF |
Why buy here