Two problems related to transmission slip out of gear have been reported for the 2004 Ford F-150. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Ford F-150 based on all problems reported for the 2004 F-150.
Had the same problem as mentioned multiple times in this list. Accelerating past 40 mph, the truck slipped out of gear and rev'd up to about 4000rpm. Did the same thing repeatedly after the first incident. Apparently a broken snap ring. Hard to believe this is not considered a safety hazard, and something that should be fixed via recall??.
Transmission slipped while driving across an intersection. Consumer was stuck in the middle to the road. When accelerating it shifted out of gear. Metal was found in the transmission. Ford said send it back to manufacturer.