2017 Raptor
As the title says truck pulls noticeably hard to the left only on 4A and 4H and only when I give it gas
Some relevant info

• Truck drives just fine on 2A
• When in 4A or 4H it only pulls to the left when i press on the gas, otherwise it drives fine
• Checked the usual on the IWE, lifted the front, placed it on 2A and turned it on and both wheels turn without turning the axle. As i turn it off and no vacuum on the IWE the wheels turn along with the axle - everything looks good
• Vacuum tested both IWEs, they were holding pressure just fine
• Since I ran out of ideas, I replaced both IWEs but no luck, still doing the same
• Lifted the truck completely off the ground, put it on 2A and only the back tires spin, changed it to 4A and both front an back tires spin

Only weird thing i have noticed is that after driving for a while on 4A the right axle is noticeable hotter than the left if i touch it on the part that is close to the IWE/wheel.

Not sure what to do next, any suggestions?

Searched around and the only thing i found was this: https://www.f150forum.com/f38/4a-acc...-right-495368/
It looks like for him and IWE replacement took care of it but not for me...

 

Check the load range on your tires especially if they are K02's still.. They come in load range C and E and will cause the pulling if they are mismatched

 

You are a genius.

I had load range E on the left (both front and back) and load range C (both front and back). I even out left and right and the thing just works, unbelievable....

Thanks!!!