6-Inch Lift Kit with N3 Shocks for 2025 GMC Sierra 1500
- Fits 2025 GMC Sierra 1500 4WD and RWD in Elevation, Pro, SLE, and SLT trim
- Not for Denali, Denali Ultimate, AT4, or AT4X models
- Requires 20-inch or larger aftermarket wheels with 4.5in backspacing; factory wheels will not work
- Cutting and drilling required — downloadable installation guide available
- Kit contents include an N3 shock pair, cast knuckles, mono-leaf rear, crossmember, and front skid
The Trail Fortress check
Will it fit your truck?
✓ Fits
✕ Does not fit
- Denali or Denali Ultimate models with
- AT4 models
- AT4X models
- Factory wheels
Requires cutting and drilling. 20-inch or larger aftermarket wheels are required. Wheels must feature 4.5in backspacing to fit. Please test fit wheels prior to installation. Some aftermarket wheels may require 0.25" wheel spacer #1065. Fitment on this page is based on the manufacturer’s application data.
About this kit
6-Inch Lift Kit with N3 Shocks, fitment-checked
Rough Country 26631_A is a 6-inch lift kit for the 2025 GMC Sierra 1500 in 4WD and RWD, covering Elevation, Pro, SLE, and SLT trims. The kit pairs a high-clearance crossmember and cast steering knuckles with an N3 shock pair and a mono-leaf rear setup. Factory wheels will not clear: plan on 20-inch or larger aftermarket wheels with 4.5in backspacing.
This 6-inch lift kit for the 2025 GMC Sierra 1500 ships as a set of boxed sub-assemblies: a mono-leaf rear package, crossmember box, front skid, front kit box, driver and passenger knuckle boxes, and an N3 shock pair. Installation calls for cutting and drilling, so set aside driveway time and read the downloadable Rough Country installation guide first. Denali and Denali Ultimate, AT4, and AT4X trims are not covered. Test-fit wheels before you commit to the build; some aftermarket wheels call for a 0.25" spacer, part #1065. Shipping weight: 233 lb.
What’s in the box
Kit contents
- 1× Universal Kit Box 21630991
- 1× 6in Kit Crossmember Box 217BOX11
- 1× FR Full Skid 217BOX3
- 1× 6in FR Kit Box 217BOX8
- 1× N3 Shock Pair 23158
- 1× 6in Kit Dr Knuckle Box 21730BOX5
- 1× 6in Kit Ps Knuckle Box 21730BOX6
Rough Country shares subassemblies across kits, so individual package labels can carry broader application ranges. The complete 26631_A kit fits the vehicles shown in the fitment section above.
Specifications
Specs
| Brand | Rough Country |
| Part number | 26631_A |
| UPC / GTIN | 00840269970689 |
| Lift height | 6 in |
| Shock package | N3 series |
| Shipping weight | 233 lb |
| Country of origin | US |
| Category | Suspension & Lift Kits › Lift Kits |
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