FABTECH 6" Radius Arm System w/ Front Dirt Logic 4.0 Coilovers & Rear Performance Shocks (K2145B) View larger

FABTECH 6" Radius Arm System w/ Front Dirt Logic 4.0 Coilovers & Rear Performance Shocks (K2145B)


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6" Radius Arm System w/ Front Dirt Logic 4.0 Coilovers & Rear Performance Shocks - 2011-14 Ford F350 4WD & 2011-13 Ford F450 4WD (8 Lug)

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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# K2145B

  • 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/ 20x9 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 FTS22103 Rear Block Kit
2 FTS7266 Rear Performance Shocks


3. Non dually models only.
27. Front drive shaft modification may be required to clear exhaust on gas motor.

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

Performance Shocks

Fabtech Performance Shocks have been designed to work in conjunction with each of our suspension systems, resulting in superior ride control. Features include high velocity 9-stage valving for excellent dampening capabilities and a closed cell insert to reduce shock fade at high speeds.

  • - Twin Tube Hydraulic Construction
  • - 9/16" Hardened Chrome Piston Rod
  • - 1 3/8" OD Piston
  • - Closed Cell Foam insert
  • - High Flow 9 Stage Valving