Ford F-150 Transmissions

Automatic transmission issues on Ford F150s is caused by any of 5 main reasons. These reasons include poor engine performance, hydraulic issues, improper adjustments, mechanical malfunctions and computer malfunctions. like any repair, it’s best to begin with the simplest resolution first.


Check the amount of the transmission fluid by visiting Eagle Transmission. The fluid amount only needs to be checked once the fluid is warm; the fluid is usually considered warm when the vehicle has been driven about twenty miles. Over-filled and under-filled conditions will cause transmission issues

Computer Malfunction

Since 1988, F150s have had an electronic engine control (EEC) system that feeds knowledge to an on-board computer. The computer instructs the transmission when it is time to shift. If the computer or part of its signal network fails, the transmission might shift hard or not shift at the correct time.

Engine Performance

Check the engine idle speed and general performance. If the engine isn’t running properly, you need to resolve any issues before resuming the transmission diagnostics. There are many sensors connected to the engine that feed data to the on-board computer; incorrect information from these sensors will cause issues that seem to be transmission-related.


Externally, the only changes that are doable for the house mechanic are to the shift linkage. Older models (pre-1991) have a shift rod that connects to the bellcrank. The rod can be disconnected at the frame and pried out of the manual control lever for adjustment or replacement. Newer models use a shift cable; adjusting the tension on this cable is essential and needs 2 people.

Mechanical Failure

If there aren’t any easily noticed issues, then the malfunction is possibly caused by a mechanical failure. Mechanical failures will vary from a worn gear that causes slipping to a broken band that stops the driver from shifting into reverse. Because of their complexity, mechanical issues ought to be left to a trained mechanic to resolve.