ReadyLIFT customers have asked for it and we have delivered. In fall of 2018 we announced our new leveling and SST lift kit offerings for the all-new GM 1500 trucks. We specifically did not include the factory lift kit-equipped GMC AT4 and Chevy Silverado Trail Boss. The AT4/Trail Boss are factory equipped with a 2" front lift. This front lift includes a longer front shock/strut assembly. When combining a traditional leveling kit on these factory lifted trucks, several issues present themselves including binding problems with the factory control arm ball joint and contact concerns with the lower strut/CV axle assembly. The ReadyLIFT 66-3921 1.75" leveling kit is similar to our popular 66-3086 leveling kit for pre-2019 trucks. The 66-3921 leveling kit provides required amount of lift without causing conflict with the factory strut geometry and clearances. In light of the factory upper control arm's lack of dynamic range when the  AT4/Trail Boss truck is further lifted, this leveling kit includes our popular tubular upper control arms with corrected ball joint cup angles, heavy-duty replaceable ball joints and out new Terrain Control Technology (TCT) maintenance-free pivot bushings with side-biter washers to improve alignment retention. Note: AT4 and Trail Boss do not fit the same size tire. This is due to the difference in front fender opening design. NOTE:     Not compatible with Sierra AT4X or Silverado ZR2 Edition. 66-3921 Leveling Kit: AT4 - Max tire 275/60-20, 20x9 0 offset wheel Trail Boss - Max tire 295/65-20, 20x9 0 offset wheel

ReadyLift 2019-2023 GMC AT4 And Chevy Trail Boss - 1.75'' Leveling Kit 66-3921

Specifications:

California Proposition 65	WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov/product.
Fitment	Direct Fitment
Front Lift Component	Spacer
Front Lift Height	1.75 Inches
Front or Rear	Front
Install Difficulty	Difficult Requires Professional Installation
Installation Time	4 Hours
Max Tire Size	295
Prop65 Chem1	Di(2-ethylhexyl)phthalate (DEHP)
Description_INV	RL 1.75'' LEVELING KIT
Description_EXT	2019-2023 GMC AT4 And Chevy Trail Boss - 1.75'' Leveling Kit
Description_MKT	ReadyLIFT customers have asked for it and we have delivered. In fall of 2018 we announced our new leveling and SST lift kit offerings for the all-new GM 1500 trucks. We specifically did not include the factory lift kit-equipped GMC AT4 and Chevy Silverado Trail Boss. The AT4/Trail Boss are factory equipped with a 2" front lift. This front lift includes a longer front shock/strut assembly. When combining a traditional leveling kit on these factory lifted trucks, several issues present themselves including binding problems with the factory control arm ball joint and contact concerns with the lower strut/CV axle assembly. The ReadyLIFT 66-3921 1.75" leveling kit is similar to our popular 66-3086 leveling kit for pre-2019 trucks. The 66-3921 leveling kit provides required amount of lift without causing conflict with the factory strut geometry and clearances. In light of the factory upper control arm's lack of dynamic range when the  AT4/Trail Boss truck is further lifted, this leveling kit includes our popular tubular upper control arms with corrected ball joint cup angles, heavy-duty replaceable ball joints and out new Terrain Control Technology (TCT) maintenance-free pivot bushings with side-biter washers to improve alignment retention. Note: AT4 and Trail Boss do not fit the same size tire. This is due to the difference in front fender opening design. NOTE:     Not compatible with Sierra AT4X or Silverado ZR2 Edition. 66-3921 Leveling Kit: AT4 - Max tire 275/60-20, 20x9 0 offset wheel Trail Boss - Max tire 295/65-20, 20x9 0 offset wheel
Description_FAB	1.75" front leveling lift
Description_FAB	Compatible with 20192023 GM AT4 and Trail Boss models
Description_FAB	Not compatible with Sierra AT4X or Silverado ZR2 Edition
Description_FAB	Includes DOM tube steel upper control arms
Description_FAB	TCT maintenancefree pivot bushings
Description_FAB	1ton ball joints
Description_FAB	CNC machined aircraftgrade billet Aluminum top and bottom strut spacers
Description_FAB	AT4 Max tire size: 275/6020
Description_FAB	AT4 Max wheel size: 20x9 with 0 offset
Description_FAB	Trail Boss Max tire size: 295/6520
Description_FAB	Trail Boss Max wheel size: 20x9 with 0 offset
Description_FAB	Compatible with 2019 Compatible with 20192023 GM AT4 and Trail Boss models
Description_FAB	TCT maintenance TCT maintenancefree pivot bushings
Description_FAB	11ton ball joints
Description_FAB	CNC machined aircraft CNC machined aircraftgrade billet Aluminum top and bottom strut spacers
Description_FAB	AT4 AT4 Max tire size: 275/6020
Description_FAB	AT4 AT4 Max wheel size: 20x9 with 0 offset
Description_FAB	Trail Boss Trail Boss Max tire size: 295/6520
Description_FAB	Trail Boss Trail Boss Max wheel size: 20x9 with 0 offset"
Description_DEF	Suspension Leveling Kit

This Part Fits:

Year	Make	Model	Submodel	Notes
2019	Chevrolet	Silverado 1500	LT Trail Boss
2020	Chevrolet	Silverado 1500	LT Trail Boss
2021	Chevrolet	Silverado 1500	LT Trail Boss
2022	Chevrolet	Silverado 1500	LT Trail Boss
2023	Chevrolet	Silverado 1500	LT Trail Boss
2024	Chevrolet	Silverado 1500	LT Trail Boss
2019	GMC	Sierra 1500	AT4
2020	GMC	Sierra 1500	AT4
2021	GMC	Sierra 1500	AT4
2022	GMC	Sierra 1500	AT4
2023	GMC	Sierra 1500	AT4
2024	GMC	Sierra 1500	AT4