6-Inch Lift Kit for 2025-2026 Chevy Silverado 1500 4WD — Part 21630D_A
- Fits 2025-2026 Chevy Silverado 1500 4WD — Custom, WT, LT, RST, LTZ, and High Country
- Not for LT Trail Boss, Custom Trail Boss, or ZR2 models
- Factory wheels will not clear: 20-inch or larger aftermarket wheels with 4.5in backspacing are required; some may need the 0.25 in #1065 spacer
- Ships as six boxes including crossmember, front, mono-leaf rear, and two cast knuckle boxes
- 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, fitment-checked
Rough Country 21630D_A is a 6-inch lift kit for the 2025-2026 Chevy Silverado 1500 4WD in Custom, WT, LT, RST, LTZ, and High Country trim. It ships as a multi-box kit with a high-clearance crossmember, cast steering knuckles, fabricated blocks, and mono-leaf rear hardware. Factory wheels will not work — plan on 20-inch or larger aftermarket wheels with 4.5in backspacing.
This 6-inch lift kit for the 2025-2026 Chevy Silverado 1500 4WD arrives as six separate boxes: a universal mono-leaf rear box, a crossmember box, front kit boxes including the diesel-specific unit, and driver- and passenger-side knuckle boxes. Cutting and drilling are part of the job, and a downloadable installation guide is available before you start. It will not work on LT Trail Boss, Custom Trail Boss, or ZR2 trucks, which leave the factory with a 2-inch lift. Test fit your wheels first; some aftermarket wheels call for the 0.25 in spacer, part 1065.
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 21700991
- 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 21630D_A kit fits the vehicles shown in the fitment section above.
Specifications
Specs
| Brand | Rough Country |
| Part number | 21630D_A |
| UPC / GTIN | 00840269970788 |
| Lift height | 6 in |
| Shipping weight | 219.18 lb |
| Country of origin | US |
| Category | Suspension & Lift Kits › Lift Kits |
| Installation guide | Downloadable PDF |
Why buy here