Cognito 7" Elite Lift Kit with Elka 2.5 DSC Reservoir Shocks | 2020-2025 Silverado/Sierra 2500HD/3500HD

The Obsidian Vision

Seven inches of front lift and five inches of rear lift on a 2020–2025 Silverado or Sierra 2500HD/3500HD is the build that defines what a properly engineered heavy-duty suspension system looks like — and the Cognito 7-Inch Elite Lift Kit with Elka 2.5 DSC Reservoir Shocks is the complete system that delivers it without guesswork. SM Series Ball Joint Upper Control Arms correct the ball joint angle and improve droop travel. SM Series Compression Struts maintain front suspension geometry at 7 inches of lift. The patented Pitman and Idler Arm Support Kit eliminates the steering system compliance that plagues GM HD trucks at elevated tie rod angles. A Deaver complete replacement leaf spring pack arched for 4 inches of rear lift, combined with a Cognito 1-inch block and U-bolt kit, delivers 5 inches of total rear lift. Stainless steel extended brake lines accommodate the increased suspension travel. And the Elka 2.5 Dual Speed Compression reservoir shocks provide user-adjustable high- and low-speed compression damping that allows the owner to tune the system for street, tow, and trail use without returning to a shop. CV driveline required for 4WD operation above 20mph — not included. All Cognito components engineered, manufactured, and assembled 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

• Lifts the front of the 2020–2025 Silverado/Sierra 2500HD/3500HD 7 inches via SM Series Ball Joint Upper Control Arms that correct the ball joint angle and improve droop travel at the elevated ride height, SM Series Compression Struts that maintain front suspension geometry at 7 inches of lift, and the patented Cognito PISK that eliminates the pitman and idler arm compliance that degrades steering precision and accelerates center link wear at elevated tie rod angles — the complete front suspension geometry correction system required for a 7-inch lift to perform as engineered.
• Delivers 5 inches of rear lift through a Deaver complete OEM replacement leaf spring pack arched for 4 inches of rear lift over stock height — eliminating the wheel hop and axle wrap that a lift block introduces — combined with a Cognito 1-inch block and U-bolt kit for the final inch of rear lift height, with stainless steel extended brake lines accommodating the increased rear suspension travel range.
• Provides elite-tier front damping through the Elka 2.5 Dual Speed Compression reservoir shocks, which allow independent user adjustment of high-speed compression (sharp impacts, washboard) and low-speed compression (body motion, cornering, towing) — the level of damping adjustability that allows the owner to optimize the system for their specific use case without replacing the shock, delivering reduced cabin vibration and noise, eliminated front-end dive under braking, prevented rear-end bucking under load, and optimized damping for towing and payload configurations.

The SM Series Ball Joint UCAs use boxed sheet metal construction, welded seams, semi-gloss black powder coat, and pre-installed maintenance-free ball joints and pivot bushings — correcting the ball joint angle and improving droop travel at 7 inches of front lift. The SM Series Compression Struts maintain the front suspension geometry that the factory struts cannot maintain at 7 inches of lift. The patented Cognito PISK converts the factory single-shear pitman and idler arm mount to a double-shear configuration, eliminating the forward and rearward center link movement that causes steering system compliance and accelerated wear. The Deaver leaf spring pack uses high-quality spring steel with a higher leaf count and thinner individual leaf material for a progressive, compliant ride at the 4-inch arched rear lift height. The Elka 2.5 DSC shocks use a 2.5-inch aluminum body with a remote reservoir that maintains a constant oil supply to the piston, preventing cavitation and aeration under sustained use. CV driveline required for 4WD operation above 20mph — sold separately. At 406 lbs, this kit ships via LTL freight carrier with residential delivery included.

Audit Table

Verified Fitment (OFAS Standard)

✅ CONFIRMED — Chevrolet Silverado 2500HD:
2020–2025 Chevrolet Silverado 2500HD Base, Custom, WT, LT, LTZ, High Country 2WD/4WD

✅ CONFIRMED — Chevrolet Silverado 3500HD:
2020–2025 Chevrolet Silverado 3500HD Base, WT, LT, LTZ, High Country 2WD/4WD SRW & DRW

✅ CONFIRMED — GMC Sierra 2500HD:
2020–2022 GMC Sierra 2500HD Base 2WD/4WD
2020–2025 GMC Sierra 2500HD SLE, SLT, AT4, Denali 2WD/4WD
2023–2025 GMC Sierra 2500HD Pro 2WD/4WD
2024–2025 GMC Sierra 2500HD Denali Ultimate 2WD/4WD

✅ CONFIRMED — GMC Sierra 3500HD:
2020–2022 GMC Sierra 3500HD Base 2WD/4WD SRW & DRW
2020–2025 GMC Sierra 3500HD SLE, SLT, AT4, Denali 2WD/4WD SRW & DRW
2023–2025 GMC Sierra 3500HD Pro 2WD/4WD SRW & DRW
2024–2025 GMC Sierra 3500HD Denali Ultimate 2WD/4WD SRW & DRW

❌ REQUIREMENTS & CRITICAL NOTICES:
⚠️ CV DRIVELINE REQUIRED FOR 4WD ABOVE 20MPH: A CV front driveline is required for safe 4WD operation above 20mph at 7 inches of front lift. The CV driveline is not included in this kit and must be purchased separately. Operating in 4WD above 20mph without a CV driveline at this lift height will cause driveline vibration and accelerated u-joint wear and failure. See the Cognito CV Driveline Kit for your specific model year and transmission configuration.
Requires front alignment immediately post-installation — at 7 inches of front lift, caster and camber correction is critical before any driving.
Requires ADAS recalibration if equipped with adaptive cruise control, forward collision warning, lane-keep assist, or Super Cruise.
Requires rear driveline angle verification post-installation to confirm u-joint operating angles are within GM's specification before towing at rated capacity.
Requires rear pinion angle check — verify the Deaver leaf spring pinion angle is within GM's specification for the installed front and rear lift height combination before towing.
Shipping Notice: At 406 lbs, this kit ships via LTL freight carrier. Residential delivery is included.

Installation & Technical Notes

Estimated Install Time: 17-Hour DIY Install — with a 2-post lift, comprehensive hand tools, torque wrench, ball joint press, and alignment appointment scheduled immediately after installation.
CV Driveline: Source and install the appropriate Cognito CV driveline kit for your model year and transmission configuration before operating in 4WD above 20mph. See the OFAS team to confirm the correct CV driveline SKU for your specific truck.
Alignment Required: Yes — professional front alignment is mandatory immediately after installation. At 7 inches of front lift, caster and camber deviation from GM's factory specification must be corrected before any driving.
ADAS Recalibration: Models equipped with adaptive cruise, forward collision warning, lane-keep assist, or Super Cruise require front camera and radar recalibration after installation.
Elka DSC Setup: Set the Elka 2.5 DSC high-speed and low-speed compression adjusters to Cognito's recommended baseline settings before driving. Fine-tune from the baseline for your specific use case.
Rear Pinion Angle: Verify the rear differential pinion angle is within GM's specification after installation. A pinion angle shim may be required depending on the front and rear lift height combination.
Torque Specifications: Refer to Cognito's included instruction sheet for all component torque values — torque all fasteners with the suspension at ride height under load.
Shipping Notice: At 406 lbs, this kit ships via LTL freight carrier. Residential delivery is included. A delivery appointment will be scheduled by the carrier.

Wheel & Tire Fitment

Maximum Confirmed Tire Size: 37x12.5" on a 10-inch wide wheel with 4.75-inch backspacing — verified clearance with this kit at 7 inches of front lift and 5 inches of rear lift on the 2020–2025 Silverado/Sierra 2500HD/3500HD platform.
Contact the OFAS team to verify inner fender clearance and offset requirements for your specific cab, bed, and fender configuration before finalizing wheel and tire selection.

Our team is standing by to verify your specific CV driveline requirement, ADAS configuration, and 37-inch tire and wheel setup for your 7-inch Elite build. Purchase with confidence; we review every build.