Two problems related to transmission not engage have been reported for the 2003 Ford F-150. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Ford F-150 based on all problems reported for the 2003 F-150.
Similar to other complaint, I discovered that my 4 wheel drive was not engaging when I turn it on using the switch on the dash. My independent excellent mechanic (I would never use the Ford dealer here) found that a wire on the transmission case had been simply disconnected. He reconnected it - no charge. Works fine. P. S. I test the operation every couple of weeks now to make sure it is working just in case I need it.
The contact owns a 2003 Ford f150. In an attempt to drive the vehicle, the four wheel drive failed to engage. The vehicle was taken to a dealer and they determined that the shift fork failed and needed to be replaced. The VIN was unknown. The current mileage was 55,661 and failure mileage was 55,650.