Cognito NorCal Truck 4" Stage 2 Package 01-10
Part# NCTStg2_TBD_Cog4
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2264.8 In Stock


Cognito Motorsports 2001-2010 GM 8-Lug 4" - 6" Front Lift Kit 

For the GM 01-10 8-Lug vehicles, including the 1500HD, 2500, 2500HD, 3500, 2500 Suburban/YukonXL/Avalanche. 

Stage 2 (Standard) Package 
Nor-Cal Truck has put this Stage 2 (Standard) Package together for the truck owner that wants to start with the basis of what he needs to complete his Cognito Motorsports lift build and have what Nor-Cal Truck feels is the #1 shock on the market to obtain a great riding truck. This kit adds 4 Bilstien's (Zinc) plated shocks, great next step over the Stage 1 package. Other Cognito product is available to add or upgrade at a later date.

Stage 2 Package Includes:

  • Cognito Motorsports #FSLK100409 - 4" Lift front box kit (Standard torsion drop style)
  • Cognito Motorsports #PISK2008 - Steering braces
  • Front Bilstien (Zinc) Plated 5100 shocks
  • Rear Bilstien (Zinc) Plated 5100 shocks
  • 2.5" Rear block & U-bolt kit


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 tubular 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 crossmembers 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. 

#FSLK100409 Front lift system components:

  • Front cross-member
  • Rear cross-member
  • Bump stop brackets
  • Skid plate
  • Differential mounts
  • Torsion bar brackets
  • Spindles all black powder coated
  • Pitman/idler arm support kit and all hardware


Stage 2 (Standard) Package Adds to complete the lift:

  • Front Bilstien (Zinc) Plated 5100 shocks
  • Rear Bilstien (Zinc) Plated 5100 shocks
  • 2.5" Rear block & U-bolt kit



  • Over-Cranking the suspension will affect ride quality and is not recommended.
  • The distance between the upper A-Arm and the metal bump stop should be no less than 3/4".
  • This kit includes our pitman and idler arm support kit.
  • Only increases the front track width by 1/2" per side.
  • 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”, ONLY ON 2500HD AND 3500 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).
  • There are many tire and wheel combos that can work on this kit (some fit better than others). The key is to keep the wheel and tire combo from sticking out of the wheel opening so you have little to no rubbing at turning on the fender.
  • Have the vehicle professionally aligned to the following specifications for the 4"-6" kit located in the installation instructions.
  • Exhaust modification may be necessary. (Gas)
  • Drive line modification may be necessary if driven in 4wd @ high speeds.








Height x Length x Width (DIM): T/F
Weight: 1.0000
Shipping Price: $200.00
Ship Via: Freight
Los Banos California93635US

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