6-Inch Vertex Coilover Lift Kit for Ford Super Duty 4WD (2023-2026)
- Fits 2023-2026 Ford F-250 and F-350 Super Duty 4WD, XL through Limited — diesel models only
- Does not fit gas engines, Tremor Off-Road Package trucks (roughly 1.5-inch factory lift), or dually models
- Vertex 2.5 adjustable front coilovers, Vertex 2.5 rear shocks, and a V2 monotube shock pair for the front
- Tubular radius arms with 2-inch outer diameter tubing bolt into OEM mounts to correct caster
- Fabricated rear blocks with 6.5-inch block U-bolt kit to limit axle wrap
- No cutting or drilling called for; downloadable installation guide available. Shipping weight: 165 lb
The Trail Fortress check
Will it fit your truck?
✓ Fits
✕ Does not fit
- Models equipped with a gas engine
- Dually models
Does NOT ft models equipped with Tremor Off-Road Package as they are equipped with approximately a 1.5-inch factory lift. Fitment on this page is based on the manufacturer’s application data.
About this kit
6-Inch Vertex Coilover Lift Kit, fitment-checked
Rough Country 400459 is a 6-inch lift kit for 2023-2026 Ford F-250 and F-350 Super Duty 4WD trucks, built around a Vertex 2.5 adjustable front coilover conversion with tubular radius arms and Vertex 2.5 rear shocks. Diesel only: it does not fit gas-engine trucks, Tremor Off-Road Package models, or duallys.
This 6-inch lift kit for the 2023-2026 Ford F-250 and F-350 Super Duty 4WD swaps the front end to height-adjustable Vertex 2.5 coilovers, adds a second V2 monotube front shock for control, and includes tubular radius arms built from 2-inch outer diameter tubing to bring caster back into range. The rear rides on fabricated blocks with a 6.5-inch block U-bolt kit and a pair of Vertex 2.5 rear shocks. Coilover mounts are fabricated from 1/4-inch material and bolt to factory locations. Confirm your truck is a diesel, single-rear-wheel model without the Tremor package, then work through the downloadable installation guide before you start.
What’s in the box
Kit contents
- 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× 6.5 In Block U-Bolt Kit 41200992
- 1× Kit Box 400330991
- 1× 6" Kit Box 400258991
- 2× Vertex 2.5 RR 6 In 695805
- 1× Radius Arm Pass Upgrade Box 43701991A
- 1× Radius Arm Dr Upgrade Box 43701992A
- 1× V2 MONOTUBE SHOCK PAIR 760818-2
Rough Country shares subassemblies across kits, so individual package labels can carry broader application ranges. The complete 400459 kit fits the vehicles shown in the fitment section above.
Specifications
Specs
| Brand | Rough Country |
| Part number | 400459 |
| UPC / GTIN | 00840269972942 |
| Lift height | 6 in |
| Shock package | Vertex series |
| Shipping weight | 165 lb |
| Country of origin | TH |
| Category | Suspension & Lift Kits › Lift Kits |
| Installation guide | Downloadable PDF |
Why buy here