One problem related to automatic transmission torque converter has been reported for the 2018 Ford F-150. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 Ford F-150 based on all problems reported for the 2018 F-150.
Transmission has a shudder when under a load. You can push the accelerator just enough at higher speeds that it doesn't down shift to make it shudder. Feels like a misfire but no codes. Also periodically when you put the truck in reverse is shakes. My dealer has replaced the torque converter and valve body on the transmission per Fords recommendation but still no fix. Truck is still well inside factory warranty.