In a major change from the E-Series, the Transit uses a unibody chassis design instead of a separate frame; while no longer using a separate chassis, the high use of boron steel allowed for increase in payload capacity of up to 600 pounds (over a similar-configuration E-Series). The long-running Twin I-Beams of the E-Series were retired, as the fourth-generation Transit uses MacPherson struts for the front suspension; the live rear axle is leaf-sprung. The model line is fitted with four-wheel disc brakes.