2011-2018 SILVERADO/SIERRA 2500HD 2WD/4WD 3" LIFT KIT. RTX Off Road offers a 3 inch lift kit solution for 2011-2018 GM 2500HD trucksthat allows for up to a 34 inch tall tire, or up to a 35x11.50 (trimming may be required). The RTX35125 GM 2500HD3 inch lift kit is a greatopportunity to lift yourtrucka true 3inches in front while increasing ground clearance. The RTX35125 3 inch lift kit includes new forged torsion keys to adjust lift up to 3 inchesand heavy duty tubular steel upper control arms designed around 3 inches of front lift geometry. This kit includes new2" tall rear blocks with longer u-bolts and rear shock extensions so you do not need up purchase longer aftermarket shocks. Also included are CNC machined front differential drop spacers to properly lower the front dif and maintain correct CV axle angles. New longer bump stops and control arm stops help contain front travel distance for safe operation. This kit does not require new tie rod ends.