4.5-Inch Lift Kit with M1 Shocks for 2017–2022 Ford Super Duty 4WD
- Fits 2017–2022 Ford F-250 and F-350 Super Duty 4WD — diesel models only, no gas engines
- Not for dually trucks, manual shift transfer cases, 3.5-inch rear axle tubes, Tremor package, or 2020 trucks with the 10-speed transmission
- Kit contents: two M1 monotube shock pairs, front coils, fabricated block and U-bolt package, and a transfer case clocking kit
- Radius arm drop brackets set proper caster to preserve factory steering feel
- Bolt-on install; downloadable installation guide available
The Trail Fortress check
Will it fit your truck?
✓ Fits
✕ Does not fit
- Gas engine models
- Manual shift transfer cases Does NOT fit dually models
- Models with 3.5" rear axle tubes Does NOT work on models equipped with Tremor Factory Trim Package Does NOT fit 2020 models with 10-speed transmission
About this kit
4.5-Inch Lift Kit with M1 Shocks, fitment-checked
Rough Country 50640 is a 4.5-inch lift kit for 2017–2022 Ford F-250 and F-350 Super Duty 4WD trucks, built around two pairs of M1 monotube shocks, front coils, fabricated blocks with U-bolts, and a transfer case clocking kit. It is diesel-only fitment: gas engines, dually models, manual shift transfer cases, 3.5-inch rear axle tubes, Tremor-package trucks, and 2020 trucks with the 10-speed transmission are all outside the fitment.
This 4.5-inch lift kit for the 2017–2022 Ford Super Duty 4WD covers F-250 and F-350 trucks in XL, XLT, Lariat, King Ranch, Platinum, and Limited trim. Two M1 monotube shock pairs handle damping front and rear, while radius arm drop brackets keep caster where the factory geometry wants it and the included transfer case clocking kit corrects driveline angle. Fabricated rear blocks ship with matched U-bolts. Read the exclusion list against your truck's engine, axle tubes, transfer case, and transmission before ordering, then work through the downloadable Rough Country installation guide.
What’s in the box
Kit contents
- 1× Kit Box 1550BOX1
- 1× Block U-Bolt 4.5in Kit 1550BOX3
- 1× Transfer Case Clocking Kit 55003
- 1× M1 MONOTUBE SHOCK PAIR 770754P
- 1× M1 MONOTUBE SHOCK PAIR 770805P
- 1× Univ. 3 4 X 4 1 X 1 2in U-Bolt Kit 7673
- 1× Coil 5d 9297
Rough Country shares subassemblies across kits, so individual package labels can carry broader application ranges. The complete 50640 kit fits the vehicles shown in the fitment section above.
Specifications
Specs
| Brand | Rough Country |
| Part number | 50640 |
| UPC / GTIN | 00840269917608 |
| Lift height | 4.5 in |
| Shock package | M1 series |
| Shipping weight | 246 lb |
| Country of origin | US |
| Category | Suspension & Lift Kits › Lift Kits |
| Installation guide | Downloadable PDF |
Why buy here