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Fabtech 4'' Ultimate System w/Dirt Logic 2.25'' Non-Res Shocks for 2011 Chevrolet/GMC Silverado/Sierra 2500HD/3500HD 4wd


  • Provides 4'' of Lift
  • Ultimate Suspension System
  • Heavy Duty Construction
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Pricing: $1,858.95


Fabtech's new 4'' Ultimate System provides less lift than our 6'' RTS system but still allows the use of 35'' tall tires for street and offroad use. We have developed this system utilizing replacement upper control arms constructed of 1.50'' OD .120'' thick wall DOM tubing with heavy duty extended range ball joints allowing for an additional 2'' of wheel travel over stock. These new upper control arms attach to our perfectly engineered ductile iron steering knuckles.

The factory torsion bars remain in the stock position and we provide new forged torsion bar adjusting keys. They are reindexed to provide the proper amount of lift without having to crank the bars.

Typically when installing only aftermarket torsion bar keys to gain lift, the ball joint and tie rod angles become severe and can lead to failure. The 4'' Ultimate system addresses this. The ball joints and tie rods are re-indexed to the proper angle with the increased ride height from the Fabtech torsion bar keys.

This system will allow use of 35'' tall tires without vehicle Stablitrac issues. In general when installing aftermarket torsion bar keys only and 35'' tires the vehicle will experience Stablitrac problems. We have corrected these issues with our proprietary system geometry allowing the vehicle's Stablitrac to function properly with 35'' tires.

The 4'' Ultimate System will level the stance of the vehicle as compared to the factory nose down rake with no change to the rear suspension. For those customers that require a factory nose down appearance an optional 1'' rear block kit is available separately.

The 4'' Ultimate System is available with Performance shocks or high end Dirt Logic shocks for superior damping.

Tire Size:

  • Use 35x13.50R18 tire w/18x9 wheels w/5 3/4'' BS w/minor trimming
  • Use 35x13.50R20 tire w/20x9 wheels w/5 3/4'' BS w/minor trimming


  • Will not fit standard cab models
  • Will not fit 17'' wheels. Stock 18'' and 20'' tires and wheels can be used. Larger tires can not be installed on stock wheels.

Application List

2011 Chevrolet Silverado 2500HD 4wd

2011 GMC Sierra 2500HD 4wd

2011 Chevrolet Silverado 3500HD 4wd

2011 GMC Sierra 3500HD 4wd


Lift Type: Standard Kit

Lift Inches: 4''

Max Tire Size: 35''


  • K1056DB
  • K1056DB
  • Fabtech
  • New


Shipping Information

  • Item Requires Shipping
  • 149.0 lbs.
  • W3.0000” x H5.0000” x L20.0000”

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