4Wheel Drive & Sport Utility Homepage

Toyota 4runner Rear Frame

The Toyota 8-inch rear axle in IFS trucks is 3 inches wider and uses larger 11.5-inch rear drum brakes. Earlier models used 10-inch drums. The greater width permits use of larger tires without hitting the frame rails.
1979-1995 Toyota 4x4 Builder's Guide - How To Trail Your Toyota

The Toyota 8-inch rear axle in IFS trucks is 3 inches wider and uses larger 11.5-inch rear drum brakes. Earlier models used 10-inch drums. The greater width permits use of larger tires without hitting the frame rails.  View Related Article