4-Inch Lift Kit with Vertex Shocks for Silverado Trail Boss & AT4
- Fits 2019–2024 Silverado 1500 and Sierra Trail Boss and AT4 models only
- Vertex 2.5 adjustable front shocks with matching rears
- Requires 20-inch or larger aftermarket wheels with 4.5-inch backspacing — factory wheels do not fit
- Does not fit diesel engines, Denali with Magnetic Ride Control, or 2019 "Classic" trucks
- High-clearance crossmember and cast knuckles; stock track width retained
- Cutting and drilling required — downloadable installation guide available
The Trail Fortress check
Will it fit your truck?
✓ Fits
+ 1 more applications
✕ Does not fit
- GMC Denali models with Magnetic Ride Control
- 2019 "Classic" models (2018 body style) ONLY fits Trailboss and AT4 models Requires cutting and drilling
- Factory wheels 20-inch or larger aftermarket wheels are required
- Diesel engine models
About this kit
4-Inch Lift Kit with Vertex Shocks, fitment-checked
A 4-inch lift kit for 2019–2024 Chevy Silverado 1500 and GMC Sierra Trail Boss and AT4 trucks (Rough Country 27550). The kit runs Vertex 2.5 adjustable front shocks and Vertex 2.5 rears with cast knuckles and a high-clearance crossmember. Requires 20-inch or larger aftermarket wheels with 4.5-inch backspacing.
This kit fits 2019–2024 Chevy Silverado 1500 and GMC Sierra Trail Boss and AT4 models only, plus the 2022 Silverado LTD and Sierra 1500 Limited versions of those trims. It combines Vertex 2.5 adjustable front shocks and Vertex 2.5 rears with cast knuckles and a high-clearance crossmember, keeping the stock track width with no strut disassembly required. Factory wheels do not fit: plan on 20-inch or larger aftermarket wheels with 4.5-inch backspacing, and test-fit wheels before installing. It does not fit diesel engines, GMC Denali trucks with Magnetic Ride Control, or 2019 "Classic" (2018 body style) trucks. Cutting and drilling required; a downloadable installation guide is available. Shipping weight: 318.37 lb.
What’s in the box
Kit contents
- 1× Universal Kit Box 217BOX1A
- 1× 6in Kit Crossmember Box 217BOX11
- 1× FR Full Skid 217BOX3
- 1× Vertex 2.5 Adj FR Lh 6in 685067L
- 1× Vertex 2.5 Adj FR Rh 6in 685067R
- 2× Vertex 2.5 RR 7 In 695739
- 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 27550 kit fits the vehicles shown in the fitment section above.
Specifications
Specs
| Brand | Rough Country |
| Part number | 27550 |
| UPC / GTIN | 00843030185978 |
| Lift height | 4 in |
| Shock package | Vertex series |
| Shipping weight | 318.37 lb |
| Country of origin | TH |
| Category | Suspension & Lift Kits › Lift Kits |
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