There are 5 automatic transmissions used in the Ford Ranger, Explorer and Mountaineer. They may be identified by checking the transmission code on the Safety Standard Certification Label attached to the driver's side door post, in the space marked Trans. The transmissions can also be identified by a tag attached to the lower left hand extension attaching bolt. The transmission codes are as follows:
All of the automatic transmissions are 4-speed units with a lock-up torque converter, except the 1997-99 5R55E, which is a 5-speed unit with a lock-up torque converter.