Our 4in Ultimate System provides less lift than our 6in RTS system but still allows use of 33in or 35in tall tires with cutting for street and offroad use. We have developed this system utilizing replacement upper control arms constructed of 1.50in OD .120in thick wall DOM tubing that attaches to heavy duty Fabtech ductile iron steering knuckles. The factory torsion bars remain in the stock position and use new forged adjusting keys to provide the proper amount of lift.

Specifications:

California Proposition 65	WARNING: Cancer & Reproductive Harm and image
Title	Fabtech 3.5 in. ULTIMATE SYS W/PERF SHKS 2011-19 GM C/K2500HD/3500HD
Description_ASC	TIRE SIZE - 33/12.50R18 Wheel - 18X9 W/5 3/4" BS W/MINOR TRIMMING; TIRE SIZE - 33/12.50R20 Wheel - 20X9 W/5 3/4" BS W/MINOR TRIMMING; TIRE SIZE - 35/13.50R18 Wheel - 18X9 W/5 3/4" BS W/FENDERWELL CUTTING; TIRE SIZE - 35/13.50R20 Wheel - 20X9 W/5 3/4" BS W/FENDERWELL CUTTING; DOES NOT FIT STANDARD CAB.; 114. WILL NOT ALLOW USE OF 17 IN. Wheels.; 124. REQUIRES CUTTING OF FENDERWELL SHEETMETAL FOR USE WITH 35 IN. TIRES
Description_DEF	Suspension Lift Kit
Description_DES	3.5" ULTIMATE SYS W/PERF SHKS 2011-19 GM C/K2500HD/3500HD
Description_EXT	3.5" ULTIMATE SYS W/PERF SHKS 2011-19 GM C/K2500HD/3500HD.
Description_INV	Fabtech-3.5" ULTIMATE SYS W/
Description_MKT	Our 4in Ultimate System provides less lift than our 6in RTS system but still allows use of 33in or 35in tall tires with cutting for street and offroad use. We have developed this system utilizing replacement upper control arms constructed of 1.50in OD .120in thick wall DOM tubing that attaches to heavy duty Fabtech ductile iron steering knuckles. The factory torsion bars remain in the stock position and use new forged adjusting keys to provide the proper amount of lift.
Description_SHO	3.5" ULTIMATE SYS W/

This Part Fits:

Year	Make	Model	Submodel	Notes
2015	Chevrolet	Silverado 2500 HD	High Country
2016	Chevrolet	Silverado 2500 HD	High Country
2017	Chevrolet	Silverado 2500 HD	High Country
2018	Chevrolet	Silverado 2500 HD	High Country
2011	Chevrolet	Silverado 2500 HD	LT
2012	Chevrolet	Silverado 2500 HD	LT
2013	Chevrolet	Silverado 2500 HD	LT
2014	Chevrolet	Silverado 2500 HD	LT
2015	Chevrolet	Silverado 2500 HD	LT
2016	Chevrolet	Silverado 2500 HD	LT
2017	Chevrolet	Silverado 2500 HD	LT
2018	Chevrolet	Silverado 2500 HD	LT
2011	Chevrolet	Silverado 2500 HD	LTZ
2012	Chevrolet	Silverado 2500 HD	LTZ
2013	Chevrolet	Silverado 2500 HD	LTZ
2014	Chevrolet	Silverado 2500 HD	LTZ
2015	Chevrolet	Silverado 2500 HD	LTZ
2016	Chevrolet	Silverado 2500 HD	LTZ
2017	Chevrolet	Silverado 2500 HD	LTZ
2018	Chevrolet	Silverado 2500 HD	LTZ
2011	Chevrolet	Silverado 2500 HD	WT
2012	Chevrolet	Silverado 2500 HD	WT
2013	Chevrolet	Silverado 2500 HD	WT
2014	Chevrolet	Silverado 2500 HD	WT
2015	Chevrolet	Silverado 2500 HD	WT
2016	Chevrolet	Silverado 2500 HD	WT
2017	Chevrolet	Silverado 2500 HD	WT
2018	Chevrolet	Silverado 2500 HD	WT
2015	GMC	Sierra 2500 HD	Base
2016	GMC	Sierra 2500 HD	Base
2017	GMC	Sierra 2500 HD	Base
2018	GMC	Sierra 2500 HD	Base
2014	GMC	Sierra 2500 HD	Denali
2015	GMC	Sierra 2500 HD	Denali
2016	GMC	Sierra 2500 HD	Denali
2017	GMC	Sierra 2500 HD	Denali
2018	GMC	Sierra 2500 HD	Denali
2011	GMC	Sierra 2500 HD	SLE
2012	GMC	Sierra 2500 HD	SLE
2013	GMC	Sierra 2500 HD	SLE
2014	GMC	Sierra 2500 HD	SLE
2015	GMC	Sierra 2500 HD	SLE
2016	GMC	Sierra 2500 HD	SLE
2017	GMC	Sierra 2500 HD	SLE
2018	GMC	Sierra 2500 HD	SLE
2011	GMC	Sierra 2500 HD	SLT
2012	GMC	Sierra 2500 HD	SLT
2013	GMC	Sierra 2500 HD	SLT
2014	GMC	Sierra 2500 HD	SLT
2015	GMC	Sierra 2500 HD	SLT
2016	GMC	Sierra 2500 HD	SLT
2017	GMC	Sierra 2500 HD	SLT
2018	GMC	Sierra 2500 HD	SLT
2011	GMC	Sierra 2500 HD	WT
2012	GMC	Sierra 2500 HD	WT
2013	GMC	Sierra 2500 HD	WT
2014	GMC	Sierra 2500 HD	WT
2011	GMC	Sierra 3500 HD	WT
2012	GMC	Sierra 3500 HD	WT
2013	GMC	Sierra 3500 HD	WT
2014	GMC	Sierra 3500 HD	WT