One problem related to transmission noise has been reported for the 1999 Ford F-150. The most recently reported issues are listed below.
I am on my second rear sliding window and it is leaking also. I am on my second transmission, and there is a clunking or slapping noise when you come to a stop. A Ford engineer says that this is normal or common on all new Ford pickup trucks. I disagree the truck did not make this sound when it was first new. They have tried 3 or 4 times to fix the popping noise in the dash and have not been able to get rid of it.