Fabtech 4 Inch Basic Lift System with Stealth Rear Shocks - K1136M | 4wheelparts.com

Fabtech 4 Inch Basic Lift System with Stealth Rear Shocks - K1136M


  • Fabtech | Part Number: FABK1136M
  • Shocks Series:Stealth Shocks
  • Tire Size:35"
  • Suspension Type:Lift Kit
  • Rear Lift Method:Block/Spacer
  • Lift kit:4 in. Suspension Lift Kit
  • Rubicon Express Suspension Type:None
  • Rear Shocks:Stealth Shocks
  • Rear Lift Component:Block and u-bolt
  • Lift Height Range:4-5.5 Inches
  • Shocks Included:Yes
  • Front Shocks:Re use OEM
  • Fitment:Direct Fit


The Chevrolet Trail Boss and GMC AT4 both have a factory 2 inch lift compared to other GM 1500 trucks of the same year model. Fabtech's suspension system for these two trucks provide a 4 inch lift height on top of the factory 2 inch lift for clearance of 35 inch tall tires. Once a Trail Boss or AT4 is lifted with a Fabtech 4 inch system, the truck will sit the same height as a 1500 with a 6 inch suspension and 35 inch tires.
Fabtech's suspension design for the Trail Boss and AT4 provides excellent drive ability both on and offroad. There is zero bump steer throughout the suspension cycle that helps reduce drive fatigue while improving the overall drive ability of the vehicle.
The near stock track width keeps the tires under the fenders for a clean appearance. Fabtech's proprietary steering knuckle geometry provides excellent lock to lock turning radius to maneuver in tight spots.
Heavy duty 1/4 inch thick steel crossmembers feature OE style alignment cam pins that utilize the factory cams for easy adjustment. Triple front diff mounts reposition the differential for vibration free operation at high speed.
The factory Trail Boss and AT4 coilover shocks are retained and relocated from the bottom to allow for full steer while achieving 4 inches of lift. Rear lift is accomplished by removing the factory 2 inch block and replacing it with a 5 inch block and u-bolt system.
Fabtech has addressed all aspects of the Trail Boss suspension for proper wheel travel and lock to lock steering without over cycling. Comes with a free 5 year 60,000 mile Powertrain Warranty.

Customer Reviews

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Question & Answers

1 Answered question

Q: Will this void manufacturer warranty on the truck or extended warranty if purchased? Answer this question

A: This would be a question for the dealership you bought the truck from.

Answered by Kelly from 4WP Corporate Headquarters on 11/17/2020


Fabtech Performance produces quality lifted suspension systems, leveling kits and shock absorbers. The company is headquarted in Chino, California. The five-acre Fabtech campus houses the product development team and the hi-tech, state-of-the-art manufacturing facility. The company manufacturers accessories for GMC, Chevrolet, Dodge, Ram, Hummer, Jeep, Nissan and Toyota off-road vehicles as well as for UTVs. Select FabTech suspension systems are FMVSS 126-certified and come with a 60,000 mile or five year Powertrain Warranty. The reason Fabtech can afford to give such a generous warranty is that they rigorously test their products on the vehicles of real customers. They install the suspension systems on the trucks, Jeeps and SUVs of random customers for free. The customers drive the vehicles like they normally would. And Fabtech regularly checks the customer's vehicle to moniter how the suspension components are performing and enduring. It is this real world testing that gives Fabtech products the quality edge. Shop Fabtech Now

This Product Fits the Following:

  • 2020 Chevrolet Silverado 1500 Custom Trail Boss  
  • 2020 Chevrolet Silverado 1500 LT Trail Boss  
  • 2020 GMC Sierra 1500 AT4  
  • 2019 Chevrolet Silverado 1500 Custom Trail Boss  
  • 2019 Chevrolet Silverado 1500 LT Trail Boss  
  • 2019 GMC Sierra 1500 AT4  


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