Two problems related to transmission gear slipping have been reported for the 1999 Ford F-150. The most recently reported issues are listed below.
Front windshield-the windshield would rattle going down the freeway everytime we would be in the truck. Took it in to advise the dealership and all they did was reseal it. Took it in again the second time and they did the same thing. After the third time I made them put in a new windshield. 2 weeks ago this cracked in half. Also the transmission was slipping. They replaced it with a new one. Also the rear end was leaking.
Windshield wipers come on unexpectedly, especially during or following turns causing a major distraction. The transmission "coasts" during deceleration. When power is applied after that the transmission seems to slip back into gear, causing the truck to jerk.