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From 1980 to 1996, Ford offered a four-wheel-drive swing arm independent front suspension called Twin-Traction Beam, or TTB. Based on its I-beam suspension from the mid '60s, Ford mounted a Dana differential in the driver-side (front) axle beam and transmitted torque to the passenger-side wheel with a double U-jointed axleshaft. Radius arms and coil springs were used on Rangers, F-150s, and Broncos, while the four-wheel-drive F-250s and F-350s got leaf springs. This TTB design has a bad reputation for wearing out tires on the street because the suspension travels in an arc (massive camber changes) as it cycles.