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Products > GMC/CHEVY 4WD > K2500HD / K3500HD 2011-18 > 4" SYSTEMS

The stock upper control arms are replaced with thick wall DOM tubular arms that feature heavy duty extended range ball joints. These ball joints provide additional strength to the vehicles suspension compared to the factory.

The stock upper control arms are replaced with our Uniball Upper Control Arms that feature .120” wall 4130 Chromoly tubing with a 1.50” OD 1” FK Stainless PTFE Uniballs that allow 9" of front wheel travel.

The crossmember systems utilize Fabtech's 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.