6-Inch Lift Kit with M1 Shocks for 2017–2022 Ford F-250 4WD
- Fits compatible 2017–2022 Ford F-250 Super Duty 4WD trims — confirm your truck against the fitment list and exclusions
- Excludes dually, gas-engine, manual-shift transfer case, 4-inch rear axle tube, and Tremor Factory Trim Package trucks; the note also lists F-350
- Only for trucks equipped with rear factory contact overload springs
- Kit contents: 6-inch front coils, radius arm kit plus two radius arm upgrade boxes, 6.5-inch block and U-bolt kit, transfer case clocking kit
- Two M1 monotube shock pairs cover front and rear
- Downloadable installation guide available — shipping weight: 274.0 lb
The Trail Fortress check
Will it fit your truck?
✓ Fits
✕ Does not fit
- Dually models
- Manual shift transfer cases Does NOT fit gas engine models
- Models with 4" rear axle tube ONLY fits models equipped with rear factory contact overload springs Does NOT work on models equipped with Tremor Factory Trim Package
Does NOT F-350 models. Fitment on this page is based on the manufacturer’s application data.
About this kit
6-Inch Lift Kit with M1 Shocks, fitment-checked
Rough Country 51240 is a 6-inch lift kit for compatible 2017–2022 Ford F-250 Super Duty 4WD diesel models, built around front coils, radius arm drop brackets, fabricated rear blocks with U-bolts, a transfer case clocking kit, and two pairs of M1 monotube shocks. It fits only trucks with rear factory contact overload springs and rules out dually, gas-engine, manual-shift transfer case, and Tremor trucks.
This 6-inch lift kit for the 2017–2022 Ford F-250 Super Duty 4WD covers XL, XLT, Lariat, King Ranch, Platinum, and Limited trims, with the fitment section showing the full list. Radius arm drop brackets reset caster so steering geometry stays close to factory, and the fabricated rear blocks are paired with a 6.5-inch block and U-bolt package. Read the exclusions closely: dually axles, manual-shift transfer cases, gas engines, a 4-inch rear axle tube, and the Tremor trim package are all out, and the note also calls out F-350 models. A downloadable Rough Country installation guide is available.
What’s in the box
Kit contents
- 1× 6.5 In Block U-Bolt Kitoverloads 1550BOX2
- 1× Radius Arm Kit Box 512BOX1
- 1× Transfer Case Clocking Kit 55003
- 1× M1 MONOTUBE SHOCK PAIR 770754P
- 1× M1 MONOTUBE SHOCK PAIR 770805P
- 1× 6 Inch Coil Box 9296
- 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 51240 kit fits the vehicles shown in the fitment section above.
Specifications
Specs
| Brand | Rough Country |
| Part number | 51240 |
| UPC / GTIN | 00840269917677 |
| Lift height | 6 in |
| Shock package | M1 series |
| Shipping weight | 274 lb |
| Country of origin | US |
| Category | Suspension & Lift Kits › Lift Kits |
| Installation guide | Downloadable PDF |
Why buy here