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Cognito 4-6" NTBD Front Lift Kit
Cognito 4-6" NTBD Front Lift Kit Cognito 4-6" NTBD Front Lift Kit

Cognito 4-6" NTBD Front Lift Kit

$2,033.00 & Free Shipping
Availability: In Stock

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WARNING: Cancer and Reproductive Harm -
Part#: 110-K0502

Cognito 4-6" NTBD Front Lift Kit  

Fits 2001-2010 Chevy/GMC 2500HD/3500HD

Part# 110-K0502

Free Standard freight is only to the lower 48  states.  International, HI, and AK, orders will require an additional shipping charge before order is shipped.

This the front lift kit only. It does not include shocks, rear suspension lift components, or other components that may be required for your specific application. See rear lift leaf springs or lift block options for 2500HD and 3500HD

Cognito 4" / 6" FSLK (Front Suspension Lift Kit) for 2001-2010 Chevrolet and GMC 1500HD / 2500 / 2500HD / 3500 / 3500HD 4WD trucks. This kit drops the front differential a full 4” and when set to the 4” height, the vehicle will retain the stock (original) tie rod and CV axle angles. When adjusted to the 6” height there will be a slight angle increase at the tie rods and CV axles. This kit is a “non-torsion bar drop” design which keeps the torsion bars in their original location rather than hanging down under the chassis. Front track width is increased by 1/2" per side in order to retain proper caster settings and functional electronic stabilizing control (if StabiliTrak equipped). We’ve incorporated a front skid plate to protect the front differential, which also ties the included Cognito front and rear cross members together for added rigidity. This kit also includes our patented Cognito Pitman and Idler Arm Support Kit—a must-have upgrade that corrects a design flaw in Chevy and GMC truck steering systems. Sway bar end links and all required mounting hardware are included and all steel bracketry is finished in semi-gloss black powder coating.


  • True 4" lift, front differential dropped 4" for stock CV axle and tie rod angles when set to 4"
  • Non torsion bar drop design
  • Fabricated spindles
  • Powder coated semi gloss black
  • Made in the USA


Built to accommodate 33" tires, this suspension lift system design uses a new spindle engineered to offer the best of all worlds in strength, flexibility, and ease of installation. On 4-wheel drive models, there are two simple cuts to make to clear the front differential and the rest is a bolt on installation. This 4" system comes standard with our revolutionary Pitman/Idler arm support kit that eliminates the premature wear found in the GM pitman and idler arm design that is present even on stock vehicles.
Flexibility to get an extra 2" out of this system is built in, just add the upper control arm kit, turn up the torsion bars or use our replacement torsion bar adjuster keys, and you will be able to run some specific 35" tall wheel and tire combinations including the Hummer H2 take offs. On 4 wheel drive models, the front differential is dropped down a full 4 inches to avoid severe CV axle angles. Other companies only drop the front differential about 75% the amount of the lower control arm, introducing poor CV axle angles.

The Cognito lift system comes standard with an incorporated skid plate that doubles as a sub-frame connector. This means that the front and rear cross members are connected to create a rigid sub-frame to position the lower control arms and front differential. Many other companies fail to provide some kind of sub-frame connection. With the replacement spindle design, and the upper control arm remaining in the factory location, the control arms are spread further apart by 4 inches. This provides more leverage on the larger wheels thus increasing ball joint life and retaining front-end alignment much better. Lift kits that drop the upper control arm along with everything else are overwhelmed by the added leverage of larger tires, straining upper ball joints and knocking front-end alignments out easily.
The new spindle is designed into this kit so that the upper control arm remains in the factory location. This makes for an easier and cleaner installation than a suspension kit that drops the UCA because there are no UCA brackets to install, and the factory bump stop perches do not have to be cut off of the frame as in most kits that relocate the UCA. With a suspension lift system of this height it is unavoidable to cut off the upper mounting ear on the front differential of 4WD vehicles. Since this cut is required, Cognito created a bracket kit to replace this mount if it is ever desired to add that mount back to return the vehicle to stock height, or to change to one of our larger lift systems. There is also one cut to make to the frame, easily made with a reciprocating saw. The rest of the installation is bolt on, as there is no welding required.


  • If you have the 6 speed Allison transmission, you will also need Cognito Shift Linkage Bracket.
  • The installation of a CV style front driveline will be required in order to safely operate the vehicle in 4WD over 20 mph, which is required to minimize driveline vibration that can lead to damaging the transfer case and/or differential.


  • Maximum wheel backspacing is 5.5”
  • Do not use a tire that is more than 4 1/2” wider than the rim width on a 4 3/4” or more backspaced wheel
  • Set at 4 to 5”, suggested tire size is 33” tall and up to 12.5” wide on an 8 to 9” wide rim with 4.25 to 5.0” back spacing
  • Set at 5 to 6”, suggested tire size is 34.5” tall and up to 12.4” wide on an 8 to 8.5” wide rim with 5.0” to 5.5” back spacing (Hummer H2 take offs fall in this suggestion)
  • Call Cognito Motorsports with wheel and tire suggestions if necessary

Cognito Warranty Registration

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