4 Inch Lift Kit | FOX 2.5 Performance Elite Coil-Over | Chevy Trail Boss or GMC AT4 1500 (20-26) 4WD | Diesel

Built for diesel truck owners who want maximum clearance and ride control without sacrificing daily drivability. This 4-inch lift kit pairs coil-over shocks with geometry-corrected control arms to preserve caster and driveline angles. You get 37-inch tire capability and the confidence that your suspension geometry stays factory-correct under load.

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

What you get up front

• Front coil-overs with geometry correction — FOX shocks mounted in newly engineered coil buckets that maintain proper caster and suspension geometry as you lift.
• Corrected upper control arms — shorter arms reset caster to OEM spec, eliminating the bump-steer and uneven tire wear that come with bolt-on lifts.
• Cast nodular iron track bar bracket — prevents axle shift and keeps your front end centered and planted.

Out back

Rear leaf springs and FOX shocks complete the 4-inch gain, tuned specifically for diesel weight distribution and heavy towing.

Pick your shocks

• FOX 2.0 Performance Series — tuned for on-road comfort and mild off-road work. Daily-driver smooth with proven durability.
• FOX 2.5 Performance Elite — internal floating piston (IFP) design with adjustable damping. Better heat management and responsiveness for towing or aggressive terrain.

Important notes

• Fits Chevy Silverado Trail Boss and GMC Sierra AT4 1500 (2020–2026) 4WD diesel only.
• Supports up to 37-inch tires. Confirm backspacing with your wheel choice to avoid contact.
• Factory air suspension is not compatible — this kit requires the coil-spring Trail Boss or AT4 variant.
• Driveshaft and transfer case angles are re-indexed during install to preserve drivetrain angles and longevity.
• OEM bump stops are trimmed as part of the lift process.

Why customers pick this at Road Runner

• BDS geometry correction means no caster complaints, no tire scrub — you keep the handling you had from the factory.
• FOX Performance Elite shocks are built to handle diesel weight and towing without constant fade or poor bump compliance.
• Our technicians install these kits weekly. Fast turnaround, zero surprises.
• Full BDS warranty backed locally — if something fails, we warranty it and fix it here.

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