Ford’s C6 transmission was first produced in 1966 and was used primarily in trucks and for high-performance big block engines. The C6 consists primarily of a torque converter, a planetary gear train controlled with a band, clutches and a hydraulic control system. The three-speed automatic was built with durability in mind, but problems can occur, particularly if the transmission has been improperly serviced or not serviced at all. Common problems include a failure of the transmission to propel the vehicle forward, overheating and leaks.
No Drive in Forward Speeds
If the vehicle will not move forward when the transmission’s gear selector is in either the first, second, or drive positions, check the manual linkage adjustment on the driver’s side of the transmission first. If the linkage is out of adjustment, the transmission may not be in gear, although the gear selector may otherwise show that the transmission is in gear.