Violent shaking

My 2013, 5.7 Liter Tundra violently shakes and feels like the trans is slipping, only when I floor it, while cruising at 70 mph. I did some research and wonder if it could be a sensor on the transmission?
My truck has about 150,000 miles on it, and is all factory.
I have intermittent dash lights that come on, (4Lo-flashing, check engine, Trac Off)
Recently had my mechanic do standard maintenance on truck, but lights were not on dash when I dropped it off.
I imagine these lights need to be on, when plugging in an OB2 scanner?

Any advise would be helpful,
Thank you

 

See if you have any codes. Also check your battery with a load tester. My first gen bucked like a bronco when it misfired and issue was a bad coil.