Cognito Tubular Series LDG Traction Bar Kit | 2011-2019 Silverado/Sierra 2500HD/3500HD 0-5.5" Lift

The Obsidian Vision

On a 2011–2019 Silverado or Sierra 2500HD/3500HD running up to 5.5 inches of rear lift, axle wrap is the torque management problem that the factory leaf spring pack was never designed to solve at elevated ride heights — and under Duramax diesel torque loads and maximum tow weight, the consequences are wheel hop, driveline vibration, and the progressive u-joint and driveshaft wear that follow every hard pull. The Cognito Tubular Series Limited Dynamic Geometry (LDG) Traction Bar Kit is engineered specifically for the 0–5.5 inch rear lift operating range on the GMT900 heavy-duty platform, delivering a heavy-duty tubular traction bar system that resists axle wrap without restricting suspension travel through the full droop and compression arc. Precision post-installation adjustability allows the owner to set traction bar preload accurately for any lift height within the operating range, delivering a system that holds driveline geometry under sustained tow loads with the Cognito signature design and semi-gloss black powder coat finish that define a properly built heavy-duty platform. Limited Lifetime Warranty. 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

• Eliminates rear axle wrap and driveline torque steer at 0–5.5 inches of rear lift on 2011–2019 Silverado/Sierra 2500HD/3500HD applications by transferring axle torque reaction loads into the frame through a rigid heavy-duty tubular bar geometry, preventing the axle rotation that causes wheel hop under hard acceleration and towing.
• Maintains full, unrestricted suspension travel across the 0–5.5 inch rear lift operating range via the Limited Dynamic Geometry design, which allows the traction bar to articulate with the axle through its complete droop and compression arc without binding or limiting shock absorber travel.
• Provides precise post-installation adjustability, enabling the owner to set traction bar preload accurately for any lift height within the 0–5.5 inch operating range without disassembling the system — essential for heavy-duty builds where payload and tow configurations vary regularly.

Cognito's Tubular Series LDG geometry is engineered to the specific bar length, mounting point placement, and pivot geometry required for the 0–5.5 inch rear lift window on the GMT900 Silverado/Sierra 2500HD/3500HD platform — a distinct specification from the 110-90590 kit designed for the 6–9 inch lift range. The LDG pivot allows the bar to follow the axle's natural arc through the full suspension travel range without inducing bind, maintaining the anti-wrap function at every point in the travel arc rather than only at static ride height. Heavy-duty tubular construction provides the torsional rigidity required to resist the torque reaction loads generated by 6.6L Duramax diesel powertrains under maximum tow rating and hard acceleration. All components are powder coated semi-gloss black and manufactured in the USA. At 97 lbs, this kit ships via LTL freight carrier with residential delivery included. Limited Lifetime Warranty.

Audit Table

Verified Fitment (OFAS Standard)

✅ CONFIRMED — Chevrolet Silverado 2500HD:
2011–2019 Chevrolet Silverado 2500HD WT, LT, LTZ 2WD/4WD
2015–2019 Chevrolet Silverado 2500HD High Country 2WD/4WD

✅ CONFIRMED — Chevrolet Silverado 3500HD:
2011–2019 Chevrolet Silverado 3500HD WT, LT, LTZ 2WD/4WD SRW & DRW
2015–2019 Chevrolet Silverado 3500HD High Country 2WD/4WD SRW & DRW

✅ CONFIRMED — GMC Sierra 2500HD:
2011–2014 GMC Sierra 2500HD WT 2WD/4WD
2011–2019 GMC Sierra 2500HD SLE, SLT, Denali 2WD/4WD
2015–2019 GMC Sierra 2500HD Base 2WD/4WD

✅ CONFIRMED — GMC Sierra 3500HD:
2011–2014 GMC Sierra 3500HD WT 2WD/4WD
2011–2019 GMC Sierra 3500HD SLE, SLT, Denali 2WD/4WD SRW & DRW
2015–2019 GMC Sierra 3500HD Base 2WD/4WD SRW & DRW

❌ REQUIREMENTS:
Designed specifically for 0–5.5 inches of rear lift — trucks running 6.0 inches or more of rear lift require the Cognito 110-90590 Tubular Series LDG Traction Bar Kit, which is engineered for the 6–9 inch operating range on this platform.
Requires rear pinion angle check post-installation to confirm driveline u-joint operating angles are within specification for the installed lift height.
Requires rear alignment verification post-installation to confirm axle centering and tracking geometry.

Installation & Technical Notes

Estimated Install Time: 3-Hour DIY Install (with basic lift equipment, hand tools, and torque wrench)
Alignment Required: Pinion angle check recommended post-installation — verify driveline u-joint operating angles are within GM's specification for the installed rear lift height to prevent vibration and accelerated u-joint wear under tow load.
Torque Specifications: Refer to Cognito's included instruction sheet for all mounting hardware torque values — torque all fasteners with the suspension at ride height under load.
Adjuster Setup: Set traction bar preload with the vehicle at ride height and the rear suspension loaded to approximate operating weight. Adjust until light preload is achieved, then verify full suspension travel is unrestricted before final torque.
Kit Selection Note: If your rear lift height is 6.0 inches or greater, order 110-90590 instead — this kit (110-90589) is not engineered for the bar geometry required above 5.5 inches of rear lift.
Shipping Notice: At 97 lbs, this kit ships via LTL freight carrier. Residential delivery is included. A delivery appointment will be scheduled by the carrier — ensure someone is available to receive the shipment.

Wheel & Tire Fitment

Traction bar fitment is independent of wheel and tire selection on the 2011–2019 Silverado/Sierra 2500HD/3500HD platform. This kit supports rear lift heights of 0–5.5 inches — verify that your wheel backspacing and tire diameter are compatible with your specific rear lift height and any fender modifications already completed on your build.

Our team is standing by to verify your specific rear lift height and confirm whether 110-90589 or 110-90590 is the correct kit for your build. Purchase with confidence; we review every build.