To simplify production, all examples were sold with four-wheel drive; a shift-on the-fly Dana 20 transfer case and locking hubs were standard. The rear axle was a Ford 9-inch axle, with Hotchkiss drive and leaf springs; the front axle was a Dana 30, replaced by a Dana 44 in 1971. In contrast to the Twin I-Beams of larger Ford trucks, the Bronco used radius arms to locate the coil-sprung front axle, along with a lateral track bar, allowing for a 34-foot turning circle, long wheel travel, and antidive geometry (useful for snowplowing). A heavier-duty suspension system was an option, along with air front springs.