Lock Right 1630. This locker means true traction. Fits 69 up with 30 spline axles. Locker replaces spider gears in differential. Very easy to install, generally takes just over an hour. You will notice an AMAZING difference in your 4 wd capabilities. Will fit your 69 up FJ40, 45, 55, 60, 70 front or rear and 80 series in the rear.