6-Inch Lift Kit with N3 Shocks for 2017–2022 Ford Super Duty 4WD — Part 51321
- Fits 2017–2022 Ford F-250 and F-350 Super Duty 4WD — review the full exclusion list below
- Diesel only: does not cover gas engine, dually, or manual shift transfer case trucks
- Also excluded: 3.5-inch rear axle tube, rear factory contact overload springs, and Tremor Factory Trim Package
- Kit includes an N3 shock kit, 6-inch coil package, 4.5-inch block and U-bolt kits, and a front CV driveshaft
- Bolt-on installation with radius arm drop brackets to set 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 Does NOT fit 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 51321 is a 6-inch lift kit for 2017–2022 Ford F-250 and F-350 Super Duty 4WD models, built around N3 series shocks, fabricated rear blocks, radius arm drop brackets, and a front CV driveshaft. It is a diesel-only application: gas engine, dually, manual shift transfer case, and Tremor Factory Trim Package trucks are not covered.
This 6-inch lift kit for the 2017–2022 Ford Super Duty 4WD fits F-250 and F-350 trucks from XL and XLT up through Lariat, King Ranch, Platinum, and Limited. The box carries a coil package, an N3 shock kit, U-bolt kits, anti-axle-wrap fabricated rear blocks, and a front CV driveshaft for diesel applications. Radius arm drop brackets keep caster where the factory geometry wants it. Confirm your truck is not a gas engine, dually, manual shift transfer case, 3.5-inch rear axle tube, factory contact overload spring, or Tremor build before ordering, then work from the downloadable Rough Country installation guide.
What’s in the box
Kit contents
- 1× 6 Inch Coil Box 9296
- 1× 4.5 In Block U-Bolt Kit No Overloads 1563BOX4
- 1× Kit Box 1504991
- 1× N3 Shock Kit 155030
- 1× Univ. 3 4 X 4 1 X 1 2in U-Bolt Kit 7673
- 1× CV Drive Shaft 5068.1
Rough Country shares subassemblies across kits, so individual package labels can carry broader application ranges. The complete 51321 kit fits the vehicles shown in the fitment section above.
Specifications
Specs
| Brand | Rough Country |
| Part number | 51321 |
| UPC / GTIN | 00843030169817 |
| Lift height | 6 in |
| Shock package | N3 series |
| Shipping weight | 247.04 lb |
| Country of origin | US |
| Category | Suspension & Lift Kits › Lift Kits |
| Installation guide | Downloadable PDF |
Why buy here