FABTECH 6" Radius Arm System w/Dirt Logic 4.0 Coilovers & Rear Performance Shocks (K2137B) View larger

FABTECH K2137DL 6" Radius Arm System w/Dirt Logic 4.0 Coilovers


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Fabtech 6" Radius Arm System w/Dirt Logic 4.0 Coilovers & Dirt logic SS Shocks


2011-16 Ford F250 4WD

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Obtain maximum front suspension damping for Super Duty's with our Dirt Logic 4.0 Coilover Conversion system. The upper coilover mounts are constructed with 1.75 diameter DOM tubing that replaces the factory coil spring mounts and span across a wide section of the frame for proper impact load distribution. The lower mounts are 1/ 4" thick steel that attach to the axle housing, providing solid mounting points for the Dirt Logic 4.0 Coilover piggyback reservoir shocks. Also included in this system are billet sway bar end links with heim ends and quad layer limiting straps.


Kit# K2137B

  • Use 315/70R17 tires w/ 17x8 wheels w/ 4 1/2” BS w/ minor trimming
  • Use 325/65R18 tires w/ 18x9.5 wheels w/ 4 3/4” BS w/ minor trimming
  • Use 35/12.50R20 tires w/ 20x10 wheels w/ 5” BS w/ minor trimming


Oty Part # Description
1 FTS22139 Component Box 1
1 FTS22143 Component Box 2
2 FTS835001 Front Dirt Logic 4.0 Coilover
1 FTS22101 Rear Block Kit
2 FTS7266 Rear Performance Shocks



27. Front drive shaft modification may be required to clear exhaust on gas motors.

Front Dirt Logic 4.0 Coilovers

As the largest vehicle specific take apart, monotube shock on earth, the Dirt Logic 4.0 continues to expand its applications to include a remote reservoir style for GM and Dodge. The Dirt Logic 4.0 will provide the ultimate in hardcore offroad dampening capacity with superior highway comfort. Nothing else comes close.

  • - 4.0" OD Steel Body
  • - 3 5/8" OD Billet Aluminum Piston
  • - 1.25" Induction Hardened Chrome Piston Rod
  • - Adjustable Coilover Construction
  • - 3/4" Spherical Ball Mounting Ends
  • - 4.0" OD Piggyback Reservoir or Remote Reservoir
  • - Black Anodized Finish


Rear 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
  • - Optional 2.25" OD Aluminum Reservoir w/-6 Stainless Steel O-ring Hose