6-Inch Lift Kit with N3 Shocks for 2025–2026 Silverado 1500 4WD
- Fits 2025–2026 Chevrolet Silverado 1500 4WD — High Country, LT, LTZ, PPV, RST, WT
- Does not fit LT Trail Boss, Custom Trail Boss, or ZR2 models
- Requires aftermarket wheels 20 inches or larger with 4.5in backspacing; factory wheels will not work
- Kit contents include a loaded strut pair, N3 shock pair, cast knuckles, high-clearance crossmember, front skid, 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
- LT Trail Boss or Custom Trail Boss models
- ZR2 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 21631_A is a 6-inch lift kit for the 2025–2026 Chevrolet Silverado 1500 4WD in High Country, LT, LTZ, PPV, RST, and WT trims. The kit pairs a loaded strut set with an N3 shock pair, cast steering knuckles, a high-clearance crossmember, a front skid plate, and mono-leaf rear hardware. Factory wheels will not clear; aftermarket wheels 20 inches or larger with 4.5in backspacing are required.
This 6-inch lift kit for the 2025–2026 Chevrolet Silverado 1500 4WD ships as a full boxed set: loaded struts, an N3 shock pair, driver and passenger knuckle boxes, a crossmember box, a front full skid, and mono-leaf rear components. Installation calls for cutting and drilling, so plan the driveway time accordingly. It does not fit LT Trail Boss, Custom Trail Boss, or ZR2 models. Test fit your wheels before assembly — some aftermarket wheels need a 0.25" spacer, part #1065. A downloadable Rough Country installation guide is available for step-by-step reference.
What’s in the box
Kit contents
- 1× Universal Kit Box 21630991
- 1× 6in Kit Crossmember Box 217BOX11
- 1× FR Full Skid 217BOX3
- 1× N3 Shock Pair 23158
- 1× Loaded Strut Pair 501067
- 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 21631_A kit fits the vehicles shown in the fitment section above.
Specifications
Specs
| Brand | Rough Country |
| Part number | 21631_A |
| UPC / GTIN | 00840269970740 |
| Lift height | 6 in |
| Shock package | N3 series |
| Shipping weight | 278 lb |
| Country of origin | US |
| Category | Suspension & Lift Kits › Lift Kits |
| Installation guide | Downloadable PDF |
Why buy here