What cause a squeak or rattle? We all know it's a slight bit of movement between adjoining surfaces either slipping on or tapping on a near by surface. I thought I might share one of my finding, it's on a 2018 Lariat but they share similar construction. It's a tapping, clicking type of sound that lasts just a single click or tick, sometimes more, lasting into seconds. It only happens on a bit of roughness in the road, not a sound on a smooth road. The quite ride inside our trucks is a wonderful feature but sure enables transmission of those irritating sounds. Its hard to tell exactly where it's coming from but I isolated mine to movement, between the door latch and where it latches to the pillar. There is a Black Loop of metal on the pillar, that the door latch, snaps around, to hold the door closed.
I isolated this before taking the truck into the dealer by rapping black electrical tape around the Black Loop. Starting with a couple or bit more of raps of tape. Then gently testing the latch's fit by gently partially closing the door as I felt and observed the markings on the tape. Backing off the excess turns until the latch just cleared. Out for a ride and again only quietness.
The Dealer later adjusted the Black Loop, rattle gone with out the tape. They had a bit of trouble, damaging the two screws, backing them out. They had me bring it back, replacing the damaged screws and the black loop which showed a bit of ware from the movement. The truck may have had about 10,000 miles on it then, none of the other door's latches showed any ware. Apparently Ford uses some type of lock tight sealant to really secure the screw. I have looked at friends F150 trucks, having in the range of 45,000 miles on them and their latch's Black Loops show no ware. The black coating still fully in tact on the contact area of the loop, no ware at all. It's interesting how the latch can close on something and never leave a contact closing mark and any other movement there. Obviously there has to be some movement there as the body flexes a bit moving down the road. Maybe someone has better insight, they would like to share.