My 2018 F150 Lariat is just what I wanted in a truck and I am extremely satisfied with it in all respects, except: 90% of the time, it will steer or drift left if there is not consistent pressure on the steering wheel. The rest of the time, I figure around 10%, it handles the way a vehicle in this category and class should. The tires seem good and balanced and tire pressures are equal. The alignment was checked and is spot on. Crown on roadways does not seem to affect the issue as it is likely to drift to the left into travel even when that means overcoming the slant of the crown. I have another appointment to check on this in two days, anything I can provide to the service tech that may help with the issue?

 

100% you have a bad tire.

not sure which one but ive had this problem a couple of times. New tires usually takes care of it

 

When they checked the alignment, did they perform a 4-wheel measurement and check thrust angle (rear axle alignment)?