Intermittent vibration/shuddering

Thanks to everyone that takes time to read my post.

I have a 2009 Tacoma 4wd V6. With approx 215k miles on it.

A few months ago I noticed a violent shuddering that would occur pretty consistently between 25 and 35 miles per hour. I had hit a large pothole just before this time that set off a faulty tire sensor light. I went and got all 4 tires balanced and this drastically improved the problem. However, the shudder is still there but very faint and very intermittent. Still happens between 25-35 mph. I took all my tires off and inspected them and rotated the tires and I could not find any noticeable issues. I can still feel the shudder every now and then and it feels the same as before I rotated the tires.

Any ideas what could be causing this?

Thanks again for your time

 

Where are you feeling it? Steering wheel, seat whole truck?

 

Not feeling it in the steering wheel. I can feel it in the seat though.