Rancho Quicklift Leveling Strut+Shocks Kit 2007-2013 Silverado/Sierra 1500 2WD/4WD Part Numbers RS999198 and RS999901 Front Pair of Struts & Springs + Rear pair of 2 shocks for vehicles at factory height or w/0-2" front Lift and w/0-1" rear Lift; These parts fit models with front struts only and will not fit "Classic" Silverado/Sierra 1500 models. Excludes HD Models. Excl. Electronic Suspension, 4 Wheel Steering, ZW7 Self-Leveling Nivomat Suspension Fits 2WD & 4WD vehicles Front height not adjustable from specified height. 9 settings of compression and dampening adjustment. Rancho's limited lifetime warranty protects against defects and premature failure. Rancho's 90 day ride guarantee covers RS5000X, RS7000MT, and RS9000XL shocks.