4" Lift Kit with Strut Spacers and Performance Rear Shocks. Not for trucks with Air Suspension. *Kit applicable for Factory wheels, Stock tire height and width up to 9 inches in wheel width. Or Aftermarket wheels with a minimum of 18 inches with 4.25 inches to 5 inches backspacing and up to 35" tires. Or aftermarket Wheels, up to 20 inches with 4.25 inches to 5.5 inches backspacing and up to 35" tires. Note: Do not use less than an 8.5 inch width rim with a 12.5 inch tire, As backspacing dimension decreases, track width and stability increases.