6.5 Inch Lift Kit | FOX 2.5 Coilover Conversion | Chevy Silverado or GMC Sierra 2500HD/3500HD (20-26) | Diesel

Built for diesel truck owners who want maximum tire clearance and geometry-corrected performance, this 6.5-inch lift kit transforms your 2020–2026 Chevy Silverado or GMC Sierra 2500HD/3500HD into a capable machine that handles 37-inch tires with room to spare. The FOX 2.5 coilover conversion replaces factory torsion bars with purpose-built shocks, upgraded control arms, and precision steering geometry correction — so your truck climbs, corners, and cruises with authority both on and off road.

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

• FOX 2.5 Coilover Shocks — High-travel dampers tuned for rough terrain and daily-drive comfort, with increased oil capacity to keep performance consistent.
• Heavy-Duty Tubular Upper Control Arms — Fabricated from 1.5" OD × .120-wall tubing, fully TIG welded with indexed ball joint cups for camber adjustment and additional down travel.
• Fully Boxed Lower Control Arms — High-strength steel construction with internal gussets and greaseable ball joints for durability and smooth operation.
• CNC-Machined Steering Knuckles — Ductile iron, ductile iron steering knuckles correct caster and geometry at the new ride height for predictable on-road handling.
• High-Arched Steel Crossmembers — 1/4-inch-thick with multi-piece differential relocation bracket and skid plates for off-road protection.
• Bump Stop Extensions, CV Spacers & Hardware — Stainless steel brake lines, sway bar links, and fasteners complete the front assembly.

Out back

Rear lift blocks install in place of the stock block to level your stance while retaining load capacity and ride quality. A U-bolt flip kit maximizes tire clearance. Pair them with FOX 2.0 Performance Series or upgrade to FOX 2.5 Performance Elite shocks for tuned off-road performance and remote-reservoir cooling.

Pick your shocks

• FOX 2.0 Performance Series — Precision-tuned, bolt-on shocks built for off-road abuse and rough-terrain travel without breaking the bank.
• FOX 2.5 Performance Elite — Remote-reservoir design with DSC adjusters (10 low-speed, 12 high-speed compression settings) for race-proven tuning versatility. Black anodized aluminum reservoir increases cooling efficiency — ideal for sustained hard use.

Important notes

• This kit is engineered for the 2500HD and 3500HD diesel powerplants (2020–2026). Verify your truck's configuration before ordering.
• Maximum tire size is 37 × 12.5. Larger tires may contact suspension or body components.
• The kit corrects driveline geometry at the new ride height — no additional modifications needed for standard driveshaft angles.
• Factory overload springs are accommodated with a dedicated block-kit variant. Choose the correct option for your leaf-spring setup at purchase.
• Bump stop extensions are included to prevent suspension bottoming at full compression.

Why customers pick this at Road Runner

• BDS geometry correction keeps your truck's steering and driveline balanced — no wandering, no premature wear.
• FOX coilovers are tuned and dyno-tested before they ship; you get race-proven damping out of the box.
• Our technicians install these kits every week — your truck is in expert hands.
• BDS warranty is backed locally by Road Runner; any issue gets resolved fast, no shipping your suspension elsewhere.
• Professional install in our shop keeps your truck on the road and out of the shop.

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