Fabtech 8" Performance System w/ Dirt Logic Shocks - 2001-06 GM C/K2500HD & C/K3500HD 2WD/4WD

The 8" Performance Suspension System is accomplished via one-piece cast drop down steering knuckles attaching to heavy-duty 1/4" thick, high arched lower control arm crossmembers with tubular upper control arms. Fabtech's combination of steering knuckle, high arched crossmembers and upper control arms provides an excellent ride quality with high ground clearance. This system will provide a true 8 inches of lift without adjustment to the torsion bars allowing the use of 37" tall tires. The front differential is properly relocated to eliminate front driveshaft vibration on 2001-06 vehicles with the stock driveshaft. On late model 2007-08 vehicles with Magna 1625 transfer cases the system requires the use of a CV front driveshaft to address high speed 4WD use. New tubular upper control arms fit into the stock frame pockets using urethane bushings. Upper control arms include double shock mounting tabs for integration with Fabtech's optional front dual shock hoop system. The front suspension is completed with an differential skid plate, tubular crossmember supports and impact struts while the torsion bar drop down brackets properly align the torsion bars to the relocated stock lower control arms. The rear suspension is lifted using a 4" block kit with 2" add a leafs. The system is completed with rear bump stop brackets and a rear driveshaft carrier bearing drop bracket.



Fabtech 8" Performance System w/ Dirt Logic Shocks - 2001-06 GM C/K2500HD & C/K3500HD 2WD/4WD

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Kit# K1015DB

  • Use 37/12.50R17 tire w/ 17x9 wheels w/ 4-5/8” BS w/ minor trimming
  • Use 37/14.00R18 tire w/ 18x9 wheels w/ 5” BS w/ minor trimming
  • Use 37/13.50R20 tires w/ 20x10 wheels w/ 5” BS w/ minor trimming


Oty Part # Description
1 FTS21011BK Component Box 1
1 FTS21012BK Component Box 2
1 FTS21013BK Component Box 3
2 FTS810201 Front Dirt Logic 2.25 Non Resi
2 FTS810211 Rear Dirt Logic 2.25 Non Resi



3. Non dually models only.
10. Requires welding, exhaust, and possible front drive shaft mods.
12. Does not fit models with Quadrasteer.
14. Can not use OEM wheel and tire.
15. Will experience some loss of turning radius.


Dirt Logic 2.25 Non Resi


The new standard in large diameter mono tube shocks for lifted applications in the OE position as well as multiple shock applications, the 2.25 provides unparalled shock performance. Available with and without reservoir the Dirt Logic 2.25 offers a supple highway ride with outstanding offroad dampening.


  • - 2.25" OD Steel Body
  • - 2.0" OD Billet Aluminum Piston
  • - 7/8" Induction Hardened Chrome Piston Rod
  • - Polyurethane Mounting Ends
  • - Optional 2.25" OD Reservoir w/-8 Stainless Steel O-ring Hose
  • - Black Anodized Finish

Vehicle Make

Chevrolet / GM

Vehicle Model

C2500, K2500

Vehicle Year

2001, 2002, 2003, 2004, 2005, 2006

Special Fitment Notes

No special fitment notes.

Manufacture Part Number


Catalog Part Number


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Installation Difficulty


Installation Instructions

Not Available

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