6-Inch Lift Kit with N3 Shocks for Ford Super Duty 4WD (2017–2022) with Front CV Drive Shaft
- Fits diesel 2017–2022 Ford F-250 and F-350 Super Duty 4WD — XL, XLT, Lariat, King Ranch, Platinum, and Limited
- Does not fit gas engine, dually, manual-shift transfer case, 3.5 in rear axle tube, or Tremor factory trim package trucks
- Only for trucks with rear factory contact overload springs
- Kit contents: 6-inch front coil package, N3 shock kit, 6.5 in fabricated rear blocks with U-bolts, and a front CV drive shaft
- Bolt-on installation with radius arm drop brackets for correct 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 ONLY fits 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 N3 Shocks, fitment-checked
Rough Country 51721 is a 6-inch lift kit for diesel 2017–2022 Ford F-250 and F-350 Super Duty 4WD trucks, from XL up through Limited. Gas-engine trucks, dually axles, manual-shift transfer cases, trucks with a 3.5 in rear axle tube, and the Tremor factory trim package are all outside the fitment; the truck must have the factory contact overload springs at the rear.
This 6-inch lift kit for the 2017–2022 Ford F-250/F-350 Super Duty 4WD builds the front with a coil package and radius arm drop brackets that let caster be reset to spec, so steering feel stays close to factory. The rear rides on fabricated anti-axle-wrap blocks with a 6.5 in block U-bolt kit, and an N3 shock kit is valved for the application front and rear. A front CV drive shaft for diesel F-250/F-350 4WD is part of the box. Confirm engine, axle, transfer case, and overload-spring configuration first, then work from the downloadable Rough Country installation guide.
What’s in the box
Kit contents
- 1× 6 Inch Coil Box 9296
- 1× 6.5 In Block U-Bolt Kitoverloads 1550BOX2
- 1× Kit Box 1504991
- 1× N3 Shock Kit 155030
- 1× Univ. 3 4 X 4 1 X 1 2in U-Bolt Kit 7675
- 1× CV Drive Shaft 5068.1
Rough Country shares subassemblies across kits, so individual package labels can carry broader application ranges. The complete 51721 kit fits the vehicles shown in the fitment section above.
Specifications
Specs
| Brand | Rough Country |
| Part number | 51721 |
| UPC / GTIN | 00843030169862 |
| Lift height | 6 in |
| Shock package | N3 series |
| Shipping weight | 262.25 lb |
| Country of origin | US |
| Category | Suspension & Lift Kits › Lift Kits |
| Installation guide | Downloadable PDF |
Why buy here