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4" Crossmember System w/ Dirt Logic 2.25 Shocks - 2011-18 GM C/K3500HD 2WD/4WD

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Included Shocks

Fabtech’s new 4” crossmember systems utilize their proven heavy duty construction and design features for a robust suspension upgrade. The 4” system features high arched lower control arm crossmembers constructed of 1/4” thick steel for maximum strength. The Fabtech ductile iron steering knuckles retain the near stock track width keeping tires under the fender for a clean appearance. Rear lift is accomplished with a block and u bolt configuration.


This system qualifies for our 5/60 Powertrain Warranty. To find out more CLICK HERE


Kit# K1123DL

  • Use 35/13.50R18 tire w/ 18x9 wheels w/ 5 3/4” BS w/ minor trimming
  • Use 35/13.50R20 tire w/ 20x9 wheels w/ 5 3/4” BS w/ minor trimming


Oty Part # Description
1 FTS21230 Component Box 1
1 FTS21231 Component Box 2
1 FTS21245 Component Box 3 - 3500HD
2 FTS811262 Front Dirt Logic 2.25 Shock
2 FTS810942 Rear Dirt Logic 2.25 Shock



14. Can not use OEM wheel and tire.
55. Must use 18" wheels or larger.
60. Fits extended and crew cab models only.

Dirt Logic 2.25 Stainless Steel Non Resi

Dirt Logic 2.25’s are designed to replace factory shocks with a larger, more robust configuration. The 2.25 size is what separates it from other replacement take apart shocks for a superior ride, both on and off road. Shocks are pretuned for each Fabtech suspension, accounting for larger tires, providing the finest all around damping.

  • - 2.25" OD Stainless Steel Body
  • - 2.0" OD Billet Aluminum Piston
  • - 7/8" NitroSteel® Black Piston Rod
  • - Polyurethane Mounting Ends
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Download PDF Instructions
FT21230i.pdf (3.7 MB)