Runs rough in 2WD…

She’s running a bit rough, as if something is rubbing underneath when I’m in 2WD and driving normally on my daily commute, when I shift into 4wd everything smoothes out and no noticeable issues. When I go back to 2wd she runs rough again. Anyone experienced this before and how do I fix it? I apologize in advance if it’s a silly question.

 

Haven't experienced it myself but it sounds like the needle bearing from what I've read here. I'd do a search and read some of the threads about how to identify if that's for sure the issue

Edit: there's actually an active one going on right now. See if it matches what you're hearing/feeling
https://www.4runners.com/threads/this-has-to-be-a-needle-bearing-right.40618/