4-Inch Lift Kit for Trail Boss & AT4 Silverado and Sierra 1500
- Built for the 2-inch factory lift on LT Trail Boss, Custom Trail Boss, and AT4 trucks
- Fits 2025–2026 Chevy Silverado 1500 and GMC Sierra 1500, 4WD
- High-clearance crossmember, full front skid plate, and cast knuckles included
- No strut disassembly required; cutting and drilling are
- Factory wheels will not fit — 20 inches or larger with 4.5 in backspacing
The Trail Fortress check
Will it fit your truck?
✓ Fits
✕ Does not fit
- Factory wheels
Requires cutting and drilling. ONLY fits LT Trail Boss Custom Trail Boss and AT4 models as they are equipped with a 2-inch factory lift. 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
4-Inch Lift Kit, fitment-checked
Only for trucks that already left the factory with a 2-inch lift: the 110330 adds 4 inches to 2025–2026 Silverado 1500 LT Trail Boss and Custom Trail Boss, and GMC Sierra 1500 AT4. A high-clearance crossmember, full front skid plate, and cast knuckles come in the boxes, and the strut assemblies do not have to come apart. Cutting and drilling are required.
This is the Trail Boss and AT4 version of Rough Country's 4-inch package, matched to the 2-inch factory lift those trucks already carry. Coverage is 2025–2026 Chevy Silverado 1500 LT Trail Boss and Custom Trail Boss plus GMC Sierra 1500 AT4, all 4WD. Inside: a high-clearance crossmember, full front skid plate, cast driver and passenger knuckles, and fabricated rear blocks, all set to retain stock track width. No strut disassembly is needed, but cutting and drilling are, and factory wheels have to give way to 20-inch or larger with 4.5 in backspacing.
What’s in the box
Kit contents
- 1× Universal Kit Box 110030991
- 1× 6in Kit Crossmember Box 217BOX11
- 1× FR Full Skid 217BOX3
- 1× 6in FR Kit Box 21731994
- 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 110330 kit fits the vehicles shown in the fitment section above.
Specifications
Specs
| Brand | Rough Country |
| Part number | 110330 |
| UPC / GTIN | 00840269966613 |
| Lift height | 4 in |
| Shipping weight | 235 lb |
| Country of origin | US |
| Category | Suspension & Lift Kits › Lift Kits |
| Installation guide | Downloadable PDF |
Why buy here