Axiom Supply Stage 3 FOX 2.0" Performance Leveling System GM HD Truck 2500 / 3500 Silverado / Sierra 2001-2010

Fitment

The Axiom Supply Stage 3 FOX 2.0 Performance Leveling System is a complete suspension upgrade engineered for GM 8-lug HD trucks and SUVs seeking increased front ride height, corrected suspension geometry, improved wheel travel, and premium FOX ride control.

Chevrolet / GMC HD Trucks

Silverado 2500HD – 2001-2010

Sierra 2500HD – 2001-2010

Silverado 3500 / 3500HD – 2001-2010

Sierra 3500 / 3500HD – 2001-2010

Silverado 1500HD – 2001-2003, 2005-2007 Classic

Sierra 1500HD – 2001-2003, 2005-2007 Classic

Silverado 2500 – 2001-2004

Sierra 2500 – 2001-2004

GM 2500-Series SUV / Hummer Applications

Chevrolet Suburban 2500 – 2001-2013

GMC Yukon XL 2500 – 2001-2013

Chevrolet Avalanche 2500 – 2002-2006

Hummer H2 – 2003-2009

Hummer H2 SUT – 2005-2009

Fitment Notes

Fits applicable 2WD and 4WD torsion-bar-equipped models.

Compatible with gas and Duramax diesel applications.

Fits both 2001-2007 Classic and 2007.5-2010 New Body Style GM HD trucks.

Provides up to 2" of adjustable front ride height.

Includes application-specific FOX Performance Series 2.0 IFP front and rear shocks designed for stock and leveled suspension configurations.

The complete Stage 3 system is intended for stock-height through approximately 2" front-leveled applications. Trucks utilizing larger suspension lifts may require different-length shocks specific to the lift system.

Designed around the factory upper control arm mounting locations.

Oversized tires may require additional wheel offset or spacers for adequate control arm clearance.

A professional alignment is required following installation.

---

Features

Complete Stage 3 Performance Suspension System – Combines Axiom Heavy-Duty Upper Control Arms, forged torsion leveling keys, Grade 12.9 ball joints, premium bushings, and a complete set of FOX Performance Series 2.0 IFP shocks into one integrated suspension package.

FOX Performance Series 2.0 IFP Shocks – Includes a complete set of FOX Performance Series 2.0 Internal Floating Piston front and rear shocks engineered to deliver improved ride quality, suspension control, and dependable performance both on and off-road.

Ride-Height Corrected Caster Geometry – Unlike many aftermarket upper control arms designed around a fixed amount of caster correction for one predetermined leveling height, the Axiom control arms feature caster correction engineered directly into the arm geometry, providing usable alignment range throughout stock, leveled, and varying ride-height configurations.

Race-Proven FOX Damping Technology – FOX's race-developed damping architecture delivers a controlled and comfortable highway ride while maintaining predictable suspension response when terrain becomes rough or demanding.

Internal Floating Piston Design – FOX's monotube IFP architecture separates the shock oil from the high-pressure nitrogen gas chamber, helping prevent oil aeration and maintain consistent damping performance under demanding operating conditions.

Application-Specific FOX Valving – The included shocks utilize vehicle-specific damping characteristics engineered for GM HD applications to provide balanced ride quality, stability, and suspension control.

High-Flow Damping Piston – FOX race-developed high-flow piston technology produces smooth, predictable damping characteristics while maintaining control through rough terrain, towing conditions, and everyday driving.

Impact-Extruded Aluminum Shock Bodies – FOX 2.0 Performance Series shock bodies utilize lightweight aluminum construction to dissipate heat efficiently while providing excellent corrosion resistance.

True Double-Shear Control Arm Construction – Built from identical upper and lower 3/16" steel plates that are precision laser cut and hand welded into a single rigid structure. Supporting the ball joint mounting area from both sides distributes suspension loads more effectively while maximizing strength and rigidity.

Equipped with AX6292 Grade 12.9 Ball Joints – Every system includes a pair of Axiom Supply AX6292 Bolt-On Upper Ball Joints featuring our Grade 12.9 Extreme-Duty Ball Stud technology for exceptional strength, steering precision, and resistance to deformation under heavy loads.

Forged Torsion Leveling Keys – Heavy-duty forged keys provide up to 2" of adjustable front ride height while maintaining proper torsion-bar indexing and adjustment range.

Corrected Suspension Geometry – Addresses the unfavorable upper ball joint and control arm angles created when the factory torsion-bar suspension is leveled, improving articulation, wheel travel, and overall suspension performance.

Increased Droop Travel – Improved upper control arm and ball joint geometry restores available downward suspension travel that can be lost when the factory suspension is leveled using torsion keys alone.

Improved Alignment Capability – Increased usable caster and camber adjustment helps alignment technicians properly set up the truck across a broader range of front ride heights.

Dual-Position Ball Joint Mounting – Allows the ball joint to be mounted above or below the control arm mounting plate, providing additional flexibility when optimizing ball joint angle, alignment, and suspension geometry.

Precision Laser-Cut Components – Manufactured using computer-designed, laser-cut steel components for exceptional fitment consistency and manufacturing accuracy.

Service-Friendly Design – Improved grease fitting access simplifies routine ball joint maintenance and lubrication.

Premium Bushing System – High-quality bushings and sleeves provide smooth articulation while minimizing unwanted suspension deflection.

Built for Heavy-Duty Use – Engineered for towing, oversized tires, off-road use, job-site duty, and everyday driving.

Lifetime Warranty Protection – Axiom suspension and steering components are backed by the Axiom No-Nonsense Lifetime Warranty for the original purchaser.

---

Description

The Axiom Supply Stage 3 FOX 2.0 Performance Leveling System for 2001-2010 GM HD Trucks was developed for owners who want more than simply raising the front of their truck.

A basic torsion-key leveling kit can increase ride height, but changing suspension height also affects upper control arm position, ball joint operating angle, droop travel, caster geometry, alignment capability, and shock performance.

The Axiom Stage 3 System addresses all of these areas as one complete suspension package.

At the foundation of the system are Axiom Supply forged torsion leveling keys, providing up to 2" of adjustable front ride height to reduce factory rake and create additional clearance for larger wheel and tire combinations.

Rather than forcing the factory shocks to operate outside their ideal range, Stage 3 replaces all four shocks with FOX Performance Series 2.0 IFP shocks specifically suited to stock and leveled GM HD suspension configurations.

FOX's monotube Internal Floating Piston architecture separates the shock oil from the high-pressure nitrogen gas chamber, helping prevent aeration and maintain consistent damping as temperatures and operating conditions change.

Race-developed high-flow pistons, application-specific valving, and aluminum shock bodies work together to provide improved suspension control while retaining the comfortable, predictable ride characteristics expected from a premium daily-driven truck.

The result is a suspension that feels more controlled over broken pavement, more composed through larger suspension movements, and more predictable when towing, hauling, or traveling off-road.

But improved damping is only part of the Stage 3 system.

Raising a torsion-bar GM HD changes the operating position of the upper control arm and can make achieving desirable caster increasingly difficult.

The included Axiom Supply Heavy-Duty Upper Control Arms address this through purpose-engineered suspension and caster geometry.

Unlike many competing aftermarket control arms that incorporate a fixed amount of caster correction intended around one predetermined lift or leveling height, Axiom engineered the caster correction directly into the control arm geometry to provide usable alignment range throughout a broad range of ride heights.

This means the alignment technician can properly set the suspension based on the truck's actual ride height and configuration, rather than forcing the truck to work around control arm geometry designed specifically for one fixed leveling setting.

The result is improved straight-line stability, steering return-to-center, alignment capability, suspension articulation, and overall driving characteristics.

The Axiom control arms also help restore available droop travel lost when the front suspension is raised with torsion keys alone. Improved upper ball joint operating angles allow the suspension to move more naturally without forcing the joint toward the limits of its available articulation.

Structurally, each control arm utilizes Axiom's true double-shear construction, built from matching upper and lower 3/16" laser-cut steel plates that are hand welded into one rigid structural assembly.

Rather than supporting the ball joint from a single mounting surface, the double-shear design supports the mounting area from both sides, distributing suspension loads more effectively while reducing flex under heavy steering and suspension loads.

Each control arm is equipped with an Axiom Supply AX6292 Bolt-On Upper Ball Joint featuring our Grade 12.9 Extreme-Duty Ball Stud technology.

The bolt-in design combines exceptional strength with long-term serviceability, allowing the ball joint itself to be replaced independently without replacing the complete upper control arm.

Axiom's dual-position ball joint mounting system adds another level of suspension setup flexibility, allowing the ball joint to be positioned above or below the mounting plate depending on the vehicle's suspension configuration.

Combined with premium bushings, precision sleeves, forged torsion leveling keys, corrected caster geometry, and a complete set of FOX 2.0 Performance Series shocks, Stage 3 creates a suspension package designed to function as a complete system rather than a collection of unrelated aftermarket components.

Whether your GM HD is a daily-driven Duramax, tow rig, work truck, off-road build, or oversized-tire street truck, the Axiom Supply Stage 3 FOX 2.0 Performance Leveling System delivers the ride height, caster correction, suspension travel, shock control, alignment capability, strength, and serviceability required to transform the way the truck looks, drives, and performs.

---

FOX Shock System

Includes application-specific FOX Performance Series 2.0 IFP shocks for front and rear suspension positions.

Front

FOX Performance Series 2.0 IFP
Designed for stock through leveled front suspension applications.

Rear

FOX Performance Series 2.0 IFP
Designed to maintain controlled rear suspension performance while complementing the upgraded front suspension.

FOX Performance Series features include:

2.0" monotube shock architecture

Internal Floating Piston design

High-pressure nitrogen gas charge

Race-developed high-flow piston

Application-specific valving

Impact-extruded aluminum shock body

Heat-treated alloy steel shock shaft

Serviceable premium construction

---

Ball Joint Interchange

The included Axiom Supply AX6292 utilizes the common aftermarket bolt-in upper ball joint pattern associated with:

K6292

MOOG K6292

The AX6292 is a serviceable bolt-in ball joint designed specifically for compatible aftermarket GM HD upper control arms.

Note: K6292 interchange applies to the bolt-in ball joint used with compatible aftermarket upper control arms. It is not the same design as the factory press-in upper ball joint used in the original stamped GM control arm.

---

Maintenance

Apply approximately 3 pumps of grease to each ball joint during installation.

For continued performance, service each ball joint every 5,000-7,000 miles.

Use only the amount of grease necessary to properly lubricate the joint and avoid over-greasing.

Periodically inspect ball joints, control arm bushings, torsion-key adjustment hardware, shocks, and suspension mounting hardware—particularly on vehicles used off-road, for heavy towing, or with oversized tires.

---

Includes

(2) Axiom Supply Heavy-Duty Upper Control Arms

(2) Axiom Supply AX6292 Grade 12.9 Bolt-On Upper Ball Joints

(2) Axiom Supply Forged Torsion Leveling Keys

(2) FOX Performance Series 2.0 IFP Front Shocks

(2) FOX Performance Series 2.0 IFP Rear Shocks

(4) Control Arm Sleeves

(8) Control Arm Bushings

(1) Complete Installation Hardware Kit

---

Interchange

2001-2010 Chevy Silverado 2500HD FOX Leveling Kit, 2001-2010 GMC Sierra 2500HD FOX Leveling Kit, Silverado 3500 FOX Leveling Kit, Silverado 3500HD FOX Leveling Kit, Sierra 3500 FOX Leveling Kit, Sierra 3500HD FOX Leveling Kit, Silverado 1500HD FOX Leveling Kit, Sierra 1500HD FOX Leveling Kit, Silverado 2500 FOX Leveling Kit, Sierra 2500 FOX Leveling Kit, Suburban 2500 FOX Leveling Kit, Yukon XL 2500 FOX Leveling Kit, Avalanche 2500 FOX Leveling Kit, Hummer H2 FOX Leveling Kit, GM HD FOX 2.0 Leveling Kit, Duramax FOX Leveling Kit, LB7 Leveling Kit, LLY Leveling Kit, LBZ Leveling Kit, LMM Leveling Kit, GM HD Upper Control Arms, GM HD Forged Torsion Keys, GM HD Caster Corrected Upper Control Arms, FOX 2.0 GM HD Shocks, K6292 Upper Ball Joint, AX6292 Upper Ball Joint

---

The Axiom No-Nonsense Lifetime Warranty

Our suspension components are warrantied for life to the original purchaser against manufacturer defects, premature wear, or breakage.

Push it to the limit—we don't care.

If the part lets you down, we'll make it right.