3" 2020-2025 GMC Sierra 2500HD/3500HD Performance Leveling Kit (w/Cognito 2.0 IFP Shocks) by Cognito

Take your GMC Sierra 2500HD/3500HD to the next level with 110-P1326, Cognito’s expertly engineered 3" Performance Leveling Kit, the result of over 23 years of innovation and hands-on suspension expertise. Designed by Cognito founder and off-road champion Justin Lambert, this comprehensive kit maximizes droop travel—converting it into increased ride height—while maintaining premium ride quality and superior on- and off-road control.

The heart of the 110-P1326 Cognito Leveling Kit is a set of Cognito 2.0 IFP aluminum shocks, specifically tuned for GMC Sierra 2500HD and 3500HD trucks. These shocks offer 35% more droop travel, are gas-charged for consistent damping, and feature rebuildable, anodized aluminum construction for durability. Paired with Cognito’s torsion keys and proprietary SM Series boxed upper control arms, this leveling kit preserves alignment integrity while optimizing suspension geometry. The included control arms feature high-angle ball joints and increased caster, along with the heavy-duty Cognito Alpha Ball Joint for unmatched performance and strength.

Also recommended is Cognito’s patented Pitman and Idler Arm Support Kit—proven to resolve steering inconsistencies and extend component life under the added stress of oversized tires and raised geometry. For those needing a rear lift or carrying added weight in the bed, an optional 1" rear block and U-bolt kit is available to achieve a leveled or slightly raked stance while maintaining shock travel integrity. Whether you're aiming for a better ride, aggressive stance, or enhanced off-road control, Cognito’s Leveling Kit is the premium, all-in-one solution engineered for long-term performance.

Features and Benefits:

• Levels your 2020+ GM 2500HD/3500HD up to 3" without compromising ride quality
• Includes Cognito 2.0 IFP aluminum front and rear shocks tuned specifically for GM HD trucks
• Shocks feature 35% more droop travel and are gas-charged to prevent oil aeration and ensure consistent damping
• Hard anodized aluminum shock body, end cap, and seal head for superior corrosion resistance
• SM Series boxed upper control arms with high-angle Alpha ball joints for improved articulation and durability
• Increased caster geometry improves highway stability and handling
• Torsion keys optimize ride height by converting droop travel into lift
• Optional Cognito Pitman and Idler Arm Support Kit resolves GM steering system weaknesses and extends component life
• Optional 1" rear block and U-bolt kit available for added rake or to counter constant rear-end load
• Bolt-on installation with pre-assembled components saves installation time and ensures a precise fit

Tire Fitment:

• 285 or 295 tire on stock wheel – Requires wheel spacer at least 1/4" to 3/8" thick; 1.5” wheel spacer looks really good
• 35x12.5 tire on stock wheel – Requires wheel spacer at least 1/2" thick; 1.5” wheel spacer looks really good; use tie back kit plus medium trimming
• 37x12.50 tire on stock wheel – Requires wheel spacer at least 1/2" thick; 1.5” wheel spacer looks really good; use tie back kit plus heavy trimming
• 285/75R18 (35x11.5), 18x9 +18mm offset – No trimming needed
• 35x12.50, 9” wide wheel +18mm offset – Minimal trimming to inner fender liner
• 35 on 10” wide wheel +18mm offset – Medium trimming; suggested use of tie back kit plus medium trimming
• 35 on 9” wide wheel, 0mm offset – Suggested use of tie back kit plus medium trimming
• 37x12.50, 9” wide wheel +18mm offset – Suggested use of tie back kit plus medium trimming
• 37x12.50, 9” wide wheel, 0mm offset – Suggested use of tie back kit plus heavy trimming
• 37x12.50 on 10” wide wheel, 0mm offset – Has been done, but not recommended unless you are okay with excessive trimming and occasional rubbing