The Traxda solid steel 3" front spacers work on the Toyota 4Runner with or without X-REAS. Every effort was made to be sure the Toyota reliability and quality are not compromised. To protect your CV joints, a differential drop is included. This kit installs in 2 to 3 hours and does not change preload so the stock ride is maintained. No disassembly of the strut is required. No after installation maintenance is required. A 1.25" rear lift is available and sold separately.