2" 2020-2026 GMC Sierra 2500HD / 3500HD - Stage 3 Leveling Kit (with 2.5 Performance Elite Shocks) by Kryptonite

The Kryptonite Stage 3 Leveling Kit with FOX 2.5 Performance Elite Shocks is a premium suspension upgrade designed for 4th Gen GMC Sierra 2500HD/3500HD trucks. Providing up to 2 inches of front lift, this system combines heavy-duty Kryptonite upper control arms, re-indexed torsion bar leveling keys, and adjustable FOX 2.5 Performance Elite reservoir shocks. The result is improved suspension geometry, increased front tire clearance, and enhanced ride control for daily driving, towing, hauling, and off-road use.

The kit features FOX 2.5 Performance Elite reservoir shocks equipped with large 2.5-inch hard-anodized aluminum bodies, race-developed high-flow pistons, and external reservoirs. The reservoir design increases oil and nitrogen capacity while improving heat dissipation, helping maintain consistent damping performance during demanding driving conditions. FOX's Dual Speed Compression (DSC) adjusters allow independent tuning of high-speed and low-speed compression damping, giving drivers the ability to tailor suspension response for highway comfort, heavy loads, towing, or rough terrain without replacing or disassembling the shocks.

To support the increased front ride height, Kryptonite includes heavy-duty boxed upper control arms constructed from laser-cut, TIG-welded steel. These reinforced arms are engineered to improve suspension geometry and alignment stability on leveled trucks while providing increased strength over factory components. Their durable construction helps maintain proper front suspension operation under the additional demands of larger tires and heavy-duty truck applications.

The included Kryptonite re-indexed torsion bar leveling keys provide up to 2 inches of front lift without requiring excessive torsion bar preload. Working together with the upgraded upper control arms, the leveling keys help maintain suspension travel and ride quality while reducing the factory front-to-rear rake. The additional ride height also provides clearance for tires up to 35 inches on most applications, although trimming may be necessary depending on tire dimensions and wheel offset.

Features & Benefits

• Designed for 4th Gen GMC Sierra 2500HD/3500HD trucks
• Provides up to 2 inches of front lift to reduce factory rake and increase tire clearance
• Includes FOX 2.5 Performance Elite reservoir shocks for both front and rear suspension
• FOX Dual Speed Compression (DSC) adjusters provide independent high-speed and low-speed compression tuning
• 2.5-inch hard-anodized aluminum shock bodies provide increased damping capacity and efficient heat dissipation
• External reservoirs increase oil and nitrogen capacity to help reduce shock fade during demanding use
• Race-developed high-flow shock pistons provide responsive damping and improved suspension control
• Heavy-duty boxed Kryptonite upper control arms feature laser-cut, TIG-welded construction for increased strength
• Upgraded upper control arms help maintain proper suspension geometry and alignment stability at increased ride heights
• Re-indexed torsion bar leveling keys provide front lift without excessive torsion bar preload
• Accommodates tires up to 35 inches on most applications, with trimming dependent on tire and wheel configuration
• Direct bolt-on installation requires no cutting or welding

What's Included

Front Suspension Components

• 1 x Kryptonite Upper Control Arm Kit – Part #KRUCA20
• 1 x Kryptonite Torsion Bar Leveling Key Set – Part #KRKEY20

Front Shocks

• 2 x FOX 2.5 Performance Elite Reservoir Front Shocks – Part #KRS084

Rear Shocks

• 2 x FOX 2.5 Performance Elite Reservoir Rear Shocks – Part #KRS085

Specifications

• Series: Stage 3
• Front Lift Height: Up to 2"
• Front Lift Method: Re-Indexed Torsion Bar Leveling Keys
• Upper Control Arms: Heavy-Duty Boxed Steel, Laser-Cut and TIG-Welded
• Shock Brand: FOX
• Shock Series: 2.5 Performance Elite
• Shock Body Diameter: 2.5"
• Shock Body Material: Hard-Anodized Aluminum
• Shock Reservoir: External Reservoir
• Shock Adjustability: Dual Speed Compression (DSC)
• Front Shocks Included: Yes, 2
• Rear Shocks Included: Yes, 2
• Installation: Bolt-On, No Cutting or Welding Required

Recommended Tires & Wheels

• Maximum Tire Size: Up to 35" on most applications
• Wheel Fitment: Clearance varies depending on wheel width, offset, and backspacing
• Trimming: May be required depending on tire selection and wheel configuration

Maintenance

Kryptonite's greaseable suspension components require periodic lubrication to maintain proper operation and service life. Apply approximately 4–6 pumps of grease during installation, followed by approximately 2–4 pumps every 5,000–7,000 miles. Grease carefully to help purge contaminants without overfilling or damaging the protective boots.