6-Inch Vertex Lift Kit for Ford Super Duty 4WD (2017–2022) — Part 55859
- Fits 2017–2022 Ford F-250 and F-350 Super Duty 4WD, XL through Limited — see the full fitment list
- Does not fit gas engine models, manual shift transfer cases, dually models, or the Tremor Factory Trim Package
- Vertex 2.5 adjustable front coilovers (4.5-inch to 6-inch) plus two Vertex 2.5 rear shocks
- Includes radius arms, transfer case clocking kit, and fabricated 4.5-inch rear blocks with U-bolts
- 10-speed transmission trucks require dial pin removal — downloadable installation guide available
The Trail Fortress check
Will it fit your truck?
✓ Fits
✕ Does not fit
- Gas engine models
- Manual shift transfer cases
- Dually models
Models equipped with a 10-speed transmission must remove dial pin. New fabricated lift block replaces the factory equipped lift block. Does NOT work on models equipped with Tremor Factory Trim Package. Fitment on this page is based on the manufacturer’s application data.
About this kit
6-Inch Vertex Lift Kit, fitment-checked
Rough Country 55859 is a 6-inch lift kit for the 2017–2022 Ford F-250 and F-350 Super Duty 4WD, built around a Vertex 2.5 coilover conversion up front and Vertex 2.5 rear shocks. Diesel-only fitment: it does not cover gas engines, manual shift transfer cases, dually axles, or the Tremor Factory Trim Package.
This 6-inch lift kit for the 2017–2022 Ford F-250/F-350 Super Duty 4WD ships as a coilover conversion package: adjustable left and right Vertex 2.5 front units rated across a 4.5-inch to 6-inch range, a pair of Vertex 2.5 rear shocks, upgraded radius arms, a transfer case clocking kit, and 4.5-inch fabricated rear blocks with matching U-bolts that replace the factory blocks. Trucks with the 10-speed transmission need the dial pin removed. Confirm your engine, transfer case, and axle configuration against the exclusion list, then work through the downloadable Rough Country installation guide before you start.
What’s in the box
Kit contents
- 1× Univ. 3 4 X 4 1 X 1 2in U-Bolt Kit 7673
- 1× Transfer Case Clocking Kit 55003
- 2× Vertex 2.5 RR 6 In 695805
- 1× 6" Kit Box 50010991
- 1× 4.5 In Block U-Bolt Kit No Overloads 1563BOX4
- 1× Radius Arm Kit Box 512BOX1
- 1× Vertex 2.5 Adj FR Lh 4.5IN-6.IN 685042L
- 1× Vertex 2.5 Adj FR Rh 4.5IN-6.IN 685042R
- 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 55859 kit fits the vehicles shown in the fitment section above.
Specifications
Specs
| Brand | Rough Country |
| Part number | 55859 |
| UPC / GTIN | 00840269919336 |
| Lift height | 6 in |
| Shock package | Vertex series |
| Shipping weight | 352 lb |
| Country of origin | TH |
| Category | Suspension & Lift Kits › Lift Kits |
| Installation guide | Downloadable PDF |
Why buy here