4 Inch Lift Kit | At4/trailboss | Vertex | Chevy/gmc 1500 (25-26)

Built for AT4 and Trailboss owners who want a commanding lifted stance without sacrificing ride quality — this 4-inch Vertex lift kit delivers the height and geometry preservation that transforms your new Silverado 1500 or Sierra 1500. Rough Country's engineering keeps suspension angles close to factory spec while opening up clearance for 33"–35" tires, so you get both aggressive looks and predictable handling on road and trail.

Installed and serviced at Road Runner Wheels & Tires. Most lift kits go in the same day. Call (678) 400-6467 to schedule.

What's included

• Universal Kit Box — mounting hardware and fasteners for your 2025–26 Silverado 1500 or Sierra 1500.
• Knuckle Boxes (driver & passenger) — cast knuckles that maintain stock track width and durability under extreme conditions.
• Crossmember Box — high-clearance drop design that reduces CV angles and preserves factory-like suspension geometry.
• Front Skid Plate — full steel protection for the front differential and underbody.
• Vertex 2.5 Adjustable Front Shocks (pair) — monotube design with 6-inch travel, tuned for the 4-inch lift height.
• Vertex 2.5 Rear Shocks (pair) — 7-inch travel, engineered to work with rear blocks and retain factory-like geometry.

Important notes

• Model-specific fitment: This kit ONLY fits LT Trailboss, Custom Trailboss, and AT4 trim levels — these models are equipped with a factory 2-inch lift. Other trims are not compatible.
• Wheel requirements: Does NOT fit factory wheels. You must use 20-inch or larger aftermarket wheels with 4.5-inch backspacing. Some aftermarket wheels may require a 0.25-inch wheel spacer (Rough Country part #1065). Test fit wheels before installation to confirm clearance.
• Installation: Requires minor cutting and drilling; a strut compressor is necessary. Estimated completion time is 8–10 hours.
• Tire clearance: This kit supports 33"–35" tires without additional modification.

Why customers pick this at Road Runner

• Geometry-corrected design — drop crossmember and cast knuckles keep suspension angles true to factory spec, so your truck handles as well as it looks.
• Vertex shocks tuned for this lift — monotube, adjustable dampening, and precise valving matched to 4-inch height and your truck's weight.
• Professionally installed by suspension techs who perform these lifts every week — backed by Rough Country's limited lifetime replacement warranty.
• In-house alignment after install — we dial in caster, camber, and toe so your new suspension and tires track straight and wear evenly.
• Local Rough Country dealer expertise — we know the AT4 and Trailboss platform inside and out.

Ready to build it? Call (678) 400-6467. Hablamos Español.