4 Inch Lift Kit | At4/trailboss | M1/m1 | Chevy/gmc 1500 (25-26)

Built for AT4 and Trailboss owners who want commanding truck presence without sacrificing ride quality — this 4-inch lift kit raises your 2025–2026 Sierra 1500 or Silverado 1500 while preserving factory-like suspension geometry. The kit supports 33"–35" tires and uses durable steel knuckles, drop crossmembers, and precision-engineered strut spacers to keep CV angles and component angles as close to stock as possible.

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 (2025 models) — structural foundation and universal mounting hardware.
• 6-inch Kit Knuckle Boxes (driver and passenger side) — cast knuckles for extreme durability and precise geometry control.
• 6-inch Kit Crossmember Box — high-clearance drop crossmember design that reduces CV angles and maintains factory-like suspension geometry.
• Front Full Skid — protective underbody shield and differential mounting.
• M1 Loaded Strut Pair — pre-assembled front struts with upper spacers that deliver lift height without compromising rigidity.
• M1 Monotube Shock Pair — rear shocks engineered to work with rear blocks and retain factory-like geometry at ride height.

Important notes

• ONLY fits LT Trailboss, Custom Trailboss, and AT4 models — these come factory-equipped with a 2-inch lift and are the only 2025–2026 Silverado 1500 and Sierra 1500 variants compatible with this kit.
• Does NOT fit OE factory wheels. 20-inch or larger aftermarket wheels are required.
• Wheels must feature minimum 4.5" backspacing. Please test-fit wheels prior to installation, as some aftermarket wheels may require a 0.25" wheel spacer.
• Installation requires cutting and drilling — minor fabrication work is necessary.
• Strut compressor required during installation.

Why customers pick this at Road Runner

• Geometry-corrected design — steel knuckles and drop crossmembers keep suspension angles factory-close, preserving ride quality after the lift.
• Rough Country limited lifetime replacement warranty backed locally — one call to Road Runner if you ever need it.
• Professionally installed by suspension techs who perform these lifts every week — no guesswork, no comebacks.
• Alignment performed in-house as part of every lift install — geometry is verified before you drive off the lot.
• Full-height 4-inch lift supports 35" tires without modification — room to grow your truck's stance.

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