This Revtek RTDD3-KB 1" Front Differential Drop Spacer kit is designed to reduce the inner CV angle 2.5 degrees on the 4wd Tundra when an aftermarket strut spacer or coilover lift has been installed. This inexpensive upgrade will help extend the life of the factory inner CV boots. Zinc plated CNC differential spacers are designed to reduce corrosion. This RTDD3-KB Differential Drop Kit is highly recommended if you are running any aftermarket coilover, a pre-load lift shock like the Bilstein Adjustable Spring Seat Shock, or a strut spacer style lift kit. This Revtek Toyota Tundra Diff Drop is intended for use on all 2007, 2008, 2009, 2010, 2011 or 2012 model year 4x4 trucks. Installation normally requires less than 1/2 hour. The factory skid plate can be re-installed with this component.