Overdrive — general information (Transit 2)

Some Ford Transit models with a G-type gearbox are additionally equipped with an overdrive transmission. The overdrive unit is attached to the rear of the gearbox and is designed as a hydraulically driven epicyclic gear. The overdrive gear is engaged in third and fourth gears, providing high highway speed at low engine speeds. The overdrive transmission is engaged and disengaged by the driver using a switch that controls an electric valve mounted on the overdrive unit. The electrical circuit also has another switch (blocker switch), preventing accidental engagement of overdrive in reverse, as well as in 1st and 2nd gears

Proper troubleshooting, repair, and assembly of the overdrive unit require specialized knowledge, factory tools, and perfectly clean working conditions. Therefore, if the unit does not operate satisfactorily, please contact your dealer for advice.

If a fault occurs in the accelerator assembly, the first thing to determine is whether the fault is electrical, mechanical or hydraulic, and this requires specialized testing equipment. Therefore, troubleshooting should be left to a Ford dealer. Do not remove the faulty overdrive unit from the vehicle until professional troubleshooting has been performed, as most tests require the unit to be in the vehicle.