Cognito Super Stock Kit | 2024-2025 Silverado 2500HD ZR2 & Sierra 2500HD AT4X

The Obsidian Vision

The 2024–2025 Silverado 2500HD ZR2 and Sierra 2500HD AT4X arrive from the factory already leveled via torsion bar and torsion key clocking — which means a conventional leveling kit cannot be added, and the question for the owner who wants more from this platform is not how to lift it, but how to make it perform at the level its price tag implies. The answer is the Cognito Super Stock Kit: a purpose-built package that addresses the three engineering compromises GM built into the AT4X and ZR2 at the factory. First, the stock tie rod angles are no longer flat with the center link at this ride height, which means GM shipped these trucks with a steering geometry that accelerates pitman and idler arm wear from the day they leave the lot — the patented Cognito Pitman and Idler Arm Support Kit fixes that flaw. Second, the stock Multimatic DSSV front shocks have only 2 inches of droop travel in this configuration, which is not enough to provide good ride quality through anything more than a gutter — the Cognito DSSV extenders increase that droop to just over 3 inches, a 50% improvement that transforms compliance through bumps and dips. Third, the Cognito SM Series Upper Control Arm Kit adds caster, maintenance-free ball joints, and maintenance-free pivot bushings to a platform that already has the geometry to run them — because refusing to conform to stock standards is its own engineering justification. Three hours. Made in the USA.

Concierge Fitment Guarantee

Every order is manually reviewed by our technicians to ensure 100% compatibility with your build before we ship.

Engineering Breakdown

• Fixes the factory steering geometry flaw on the 2024–2025 AT4X and ZR2 via the patented Cognito Pitman and Idler Arm Support Kit — at the factory ride height of these models, tie rod angles are no longer flat with the center link, placing the pitman and idler arms in an operating condition that accelerates their wear and degrades front tire wear patterns from the first mile. The PISK addresses the root cause, not the symptom.
• Increases front suspension droop travel from 2 inches to just over 3 inches via the Cognito DSSV extenders, which add a precisely calculated spacer to the stock Multimatic DSSV front shocks — the 50% droop travel increase allows the front suspension to comply with bumps and dips without the harsh shock top-out that the factory 2-inch droop limit produces, delivering the ride quality that a truck at this price point should have delivered from the factory.
• Upgrades the front upper control arms with the Cognito SM Series UCA Kit, adding caster correction, maintenance-free ball joints, and maintenance-free pivot bushings to a platform whose OEM upper arms were already designed for this ride height — because the OEM arms are adequate, and the Cognito arms are better, and the difference between adequate and better is exactly what the Super Stock Kit is built around.

The 2024–2025 Sierra 2500HD AT4X and Silverado 2500HD ZR2 use a unique front suspension configuration with OEM upper control arms, knuckles, and lower control arms specifically designed for the factory-leveled ride height achieved through torsion bar and torsion key clocking. The factory 1.5-inch rear lift block creates the visual rake that makes the truck appear unlevel despite the front being at leveling kit height. The Multimatic DSSV (Dual Sensitivity Spool Valve) front shocks are a premium OEM damper that Cognito's DSSV extenders work with — not replace — by adding the precise spacer required to unlock additional droop travel within the shock's operating range. The SM Series UCAs feature boxed sheet-metal construction, CNC-welded seams, semi-gloss black powder coat, maintenance-free ball joints, and maintenance-free pivot bushings. All Cognito components are manufactured in the USA.

Audit Table

Verified Fitment (OFAS Standard)

✅ CONFIRMED:
2024–2025 Chevrolet Silverado 2500HD ZR2 4WD
2024–2025 GMC Sierra 2500HD AT4X 4WD

❌ REQUIREMENTS:
⚠️ NO ADDITIONAL LIFT: This kit does not add lift height. The AT4X and ZR2 are already factory-leveled via torsion bar and torsion key clocking — a conventional leveling kit cannot be added to these models. This kit improves ride quality, steering longevity, and front suspension droop travel at the factory ride height.
Requires front alignment after UCA installation — the SM Series UCAs add caster correction that must be verified and set to specification before driving.
The DSSV extenders are precision-calculated for the stock Multimatic DSSV front shocks — do not install on trucks where the factory DSSV shocks have been replaced with aftermarket shocks, as the extender spacer dimension is specific to the OEM DSSV shock body length.

Installation & Technical Notes

Estimated Install Time: 3-Hour DIY Install (with basic hand tools, floor jack, jack stands, and torque wrench — alignment appointment required after UCA installation)
Alignment Required: Yes — professional front alignment is required after UCA installation. The SM Series UCAs add caster correction; verify and set caster and camber to specification before driving.
DSSV Extender Installation: Install the DSSV extenders on the stock Multimatic DSSV front shocks only. Verify the factory DSSV shocks are present and undamaged before installation. The extenders add a precisely calculated spacer — do not modify the spacer dimension or substitute alternative hardware.
Torque Specifications: Refer to Cognito's included instruction sheet for all UCA mounting and PISK hardware torque values — torque with the suspension at ride height under load.

Wheel & Tire Fitment

The Cognito Super Stock Kit does not change the ride height of the 2024–2025 Silverado 2500HD ZR2 or Sierra 2500HD AT4X. Wheel and tire fitment remains as specified by GM for the factory ride height of these models. Contact the OFAS team for wheel and tire upgrade recommendations compatible with the AT4X and ZR2 factory suspension configuration.

Our team is standing by to verify your specific AT4X or ZR2 configuration and confirm 110-P1268 is the correct Super Stock Kit for your build. Purchase with confidence; we review every build.