Introduced by Ford in 1989, the E4OD was the successor to the C6 transmission and was Ford's first electronically controlled automatic transmission. It comes equipped with four forward speeds as well as electronic shift controls to replace the hydraulic governor control of its predecessor. The E4OD transmission can be found in applications such as the Bronco, the Expedition, and the F-Series. Monster provides a heavy-duty and a super-sport model for additional rating on horsepower and torque.