Alignment Issues: Could It Be the Tires?

I'm at the dealer right now with 2018 @ 6700 miles getting the one year check. Taco has pulled slightly right since new. Does it on a flat parking lot a 10 mph or freeway at 75 mph. Don't think it's a crowned road issue. Reported the issue at the 6 month check which the tech "confirmed". Think it drove straight after that for awhile but soon picked up the drift again.

So I got the "all we can do is put it in spec" disclaimer from service writer today. I said I understand there are tolerances to in spec with the thought that tweaking one setting, while still keeping in spec, will correct a slight right drift.

He didn't seem to get my point. Am I wrong about this? If not, can someone tell me what I should suggest they adjust a little to get the desired effect? I'm thinking toe-in but don't know much about alignments.

 

Post-check alignment report.

All adjustments were within spec on initial inspection however the tech adjusted :

Lt Caster from 2.1 to 2.2
Rt Caster from 1.9 to 2.0
Rt Camber from .8 to .4
Lt Toe from .35 to .25
Lt SAI from 11.7 to 11.8
Rt SAI from 11.3 to 11.5
Lt Included angle from 11.8 to 11.9
Rt Included angle from 12.1 to 11.9.

On the short drive home, both freeway and side-streets, the truck appears to track straight.

 

It still seems like your caster numbers are transposed. You generally want .3-.5 degrees on the left and you've got the opposite. Why they can't figure that out is beyond me and why they don't know why there are tolerances to the spec and what those mean are even further beyond me. I mean, jeez, it's their freaking job to know that. If it were me I'd try and get both camber settings a tick on the negative side rather than the positive. Drives better and actually wears better too. Good luck there.

 

As mentioned above, your caster is opposite. Also your list of numbers is not complete. What was the right side camber? What is the total toe? The before and after numbers you posted have changed very little and I suspect that nothing was adjusted. You could get those number changes just by sitting in the vehicle. Your problem was most likely that the tire on the right side had a higher rolling resistance than the left. They swapped the two front tires from left to right and now the pull from the left tire is enough to offset the reverse caster numbers you have.

 

Lt Camber was .1 before and after. (Spec for this is -.02 to + 1.3)
LT and RT Toes and Total Toe were all zeros before and after.

The Toe I reported earlier was rear tire. Total there went from +.05 to -.05

Tech apparently drove the truck a time or two - it had 7 miles more when I left then when I brought it in.