Vibration

Ok here is is I have a 2016 sport and it originally felt like my rear wheels needed balance I brought it back to the dealer and he told me 3 of my 4 tires had been out of round...something about surface area. But guess what it isn't that... Feels like at spuratitc time I drive over a rumblestrip ecept there is no strip.... 3100 miles?

 

Is it while driving or while braking?
If braking, there's lots of threads relates warped drums, warped axles, diff angle, etc. Many TSBs already exist. Here's a link to a list of TSBs
https://www.tacomaworld.com/threads/list-of-t-sbs-etc.562671/

 

Another common problem is a cyclical type vibration that occurs when driving. A quick way to determine this is .. if you're driving in a straight line and you feel it happening, toss it into 4hi and see if it goes away. If it does, you'll need to take it in to the dealer to have them examine the front differential. There is a TSB on this.

 

Rumble strip?
Sporadic? Like under deceleration(no braking) and light load cruise conditions?

I'll go with TCC, flex lock-up, SLU solenoid, torque converter, etc.

 

Could be alot of things. But i would make them fix it or file a complaint on a stock truck to say the least.