Check Control Arms: GM produced cast steel, stamped steel and aluminum control arms between 2014 and 2018. Use the reference image to help identify your stock control arms; cast steel will be replaced with cast steel, stamped steel and aluminum control arms will be replaced with aluminum.Is your truck a crew cab? Add an Add-A-Leaf to your kit to offset the increased weight of the cab for a more level stance.Factory 17" and 18" wheels cannot be reinstalled due to tie rod end interference.Fitment: All wheel drive models may require front CV driveshaft. See installation instructions for more information.Fitment: Will NOT fit models equipped with MagneRide magnetic ride control.Use a 1/4" wheel spacer to accommodate factory 20" wheels; refer to the provided "Max Tire Size" for 20" wheels for tire sizing.Wheels / Tires: For optimal tire clearance and reduce the need for trimming, use 20x9 wheels with 5.75" backspacing.

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