Steering wheel shake in reverse

Tundra gurus,

Post-lift, rims, and tires, I did the CMC and am welding the plates on today however at full lock in reverse, there is some feeling in the steering wheel that makes it feel like I am rubbing somewhere. I had someone reverse it in all directions while I watched and listened and I am 99% sure I am not rubbing anywhere. I've checked the common places such as the CMC, fender liners, and skid plate but didn't see anything. Any ideas what might be going on?

I've driven in all other directions going forward and it is fine but in reverse at full lock it feels like there is something going on. I have a little over 6,000 miles on the truck.

 

Did you get an alignment?

 

We had the same problem with my boys 4Runner, on certain turns in reverse. It ended up being the side lugs rubbing his UCAs. Down hill in reverse with sharp turns and uneven ground. that would be a place to check.

 

I am thinking it might just be the new tires I went from the stock Michelins to Ridge Grapplers. Maybe it is just my OCD kicking in...