6-Inch Lift Kit with N3 Shocks for 2025 GMC Sierra 1500
- Fits 2025 GMC Sierra 1500 in 4WD and RWD — Elevation, Pro, SLE, and SLT
- Not for Denali or Denali Ultimate (Adaptive Ride Control), AT4, or AT4X models
- Requires 20-inch or larger aftermarket wheels with 4.5in backspacing; factory wheels will not fit
- Kit includes an N3 shock pair, high-clearance crossmember, cast knuckles, and mono leaf rear parts
- Cutting and drilling required — downloadable installation guide available
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 26631D_A is a 6-inch lift kit for 2025 GMC Sierra 1500 4WD and RWD models in Elevation, Pro, SLE, and SLT trim. The kit pairs a high-clearance crossmember, cast steering knuckles, and a mono leaf rear setup with an N3 shock pair. Denali, Denali Ultimate, AT4, and AT4X models are not covered, and factory wheels will not clear.
This 6-inch lift kit for the 2025 GMC Sierra 1500 4WD and RWD ships as a multi-box kit: front crossmember and front-end hardware, driver and passenger cast knuckles, mono leaf rear components, and an N3 shock pair. Cutting and drilling are part of the job, so plan the driveway time accordingly. Wheel selection matters here — factory wheels do not clear, and you will need aftermarket wheels of 20 inches or larger with 4.5in backspacing. Some wheels may call for the 0.25 inch spacer, part 1065. Test fit before final assembly, and pull the downloadable Rough Country installation guide first.
What’s in the box
Kit contents
- 1× Universal Kit Box 21630991
- 1× 6in Kit Crossmember Box 217BOX11
- 1× Diesel 6in FR Kit Box 217BOX10
- 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 26631D_A kit fits the vehicles shown in the fitment section above.
Specifications
Specs
| Brand | Rough Country |
| Part number | 26631D_A |
| UPC / GTIN | 00840269970726 |
| Lift height | 6 in |
| Shock package | N3 series |
| Shipping weight | 221 lb |
| Country of origin | US |
| Category | Suspension & Lift Kits › Lift Kits |
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