Fabtech's new 4" crossmember systems utilize their 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.

This Part Fits:

Year	Make	Model	Submodel
2018	Chevrolet	Silverado 2500 HD	High Country
2018	Chevrolet	Silverado 2500 HD	LT
2018	Chevrolet	Silverado 2500 HD	LTZ
2018	Chevrolet	Silverado 2500 HD	WT
2015-2019	Chevrolet	Silverado 3500 HD	High Country
2011-2019	Chevrolet	Silverado 3500 HD	LT
2011-2019	Chevrolet	Silverado 3500 HD	LTZ
2011-2019	Chevrolet	Silverado 3500 HD	WT
2018	GMC	Sierra 2500 HD	Base
2018	GMC	Sierra 2500 HD	Denali
2018	GMC	Sierra 2500 HD	SLE
2018	GMC	Sierra 2500 HD	SLT
2015-2018	GMC	Sierra 3500 HD	Base
2011-2018	GMC	Sierra 3500 HD	Denali
2011-2018	GMC	Sierra 3500 HD	SLE
2011-2018	GMC	Sierra 3500 HD	SLT
2011-2014	GMC	Sierra 3500 HD	WT