ReadyLIFT offers a solution for leveling 2014-2018 GM 1500 trucks. GM modified the upper control arms to stamped steel, which lacks support for the factory ball joint in lifted scenarios. GM prohibits lift or leveling kits for these vehicles. This kit is compatible with GM 1500 trucks with stamped steel or aluminum control arm suspension (not cast steel). You can identify your control arms [here](www.readylift.com/blog/2017/07/11/upper-control-arms). ReadyLIFT's solution includes a CNC machined billet aircraft-grade aluminum 2.25" leveling kit and durable DOM-tube steel upper control arms. These arms replace the factory stamped steel ones, featuring heavy-duty ball joints and maintenance-free anti-resistance bushings. This combination (PN 66-3086) levels 2017-2018 GM 1500 trucks, maintaining the factory ride and preventing stamped steel control arm failure. It allows up to 33x11.50 tires. Some vehicles may need the 15-3485 1/2" front wheel spacer with certain factory wheels. The kit includes CNC machined billet aluminum construction leveling kit, DOM tube steel upper control arms, heavy-duty ball joints, and maintenance-free bushings with "side biter" splined washers for alignment. To ensure proper fitment, measure from the wheel hub center to the fender's bottom edge at 12 o'clock while the wheels face forward. If it's over 22", the truck has pre-installed lift. Install the ReadyLIFT leveling kit without the lower horseshoe spacer for correct front lift height and suspension geometry. Incorrect use on trucks with over 22" may result in component interference and excessive wear. For more information, visit [here](www.readylift.com/blog/2017/07/11/upper-control-arms) or watch the [video](youtu.be/mGWolZSgu4k) about this kit. Some vehicles may require the 15-3485 1/2" front wheel spacer when using factory wheels, depending on wheel options and backspacing. To fit a 285 or larger tire on factory wheels, you may need 1/2" wheel spacers in front.