aFe CONTROL Leveling Kits are made from 6061 billet aluminum and provide a 2.5-Inch lift in the front and a 1-Inch lift in the rear to provide better off-road performance while also eliminating the "nose-down rake" notorious on stock trucks. This kit includes two spacers for each strut, allowing for a range of lift heights. Both the shim and pre-load spring spacers together make for the maximum lift allowable without compromising the efficiency of the stock shock. Using one or the other will make for a low or moderate lift height. Installation of these leveling spacers can be done at home with the proper tools and safety precautions. Installing these spacers requires disassembly of the strut/spring. A spring compressor is required to install the pre-load spring spacer.