Fabtech 14-18 GM C/K1500 P/U w/oE Forg Stl UCA 4in Basic Sys w/StealthFabtech's new 4in crossmember systems utilize their proven heavy duty construction and design features found in their 6in systems but with less lift for use with 33in tall tires. These 4in systems feature high arched lower control arm crossmembers constructed of 1 4in thick steel for maximum strength. The Fabtech ductile iron steering knuckles retain the stock track width keeping tires under the fender for a clean appearance. Rear lift is accomplished