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balance front tires
Sounds like wheel balance, but check the steering dampner.
Check into a new steering dampner, it's a common cause for shake at speed in a Jeep, but it could also be alignment or balance.
have your front tires rebalanced.
More than likely you have a tire out of balance. Have your tires rotated, inspected, and balanced.
Maybe engine misfire.
I needed new brakes when my 2003 Vue shook at 50mph. Once I had the back brakes changed the shaking stopped.
Get you front end aligned, that should take care of the shakes.
You bet it can. A bent or out of balance drive shaft will cause serious shaking. A defective U-Joint will also cause it to shake and is very dangerous.
drove (or driven) and shook (or shaken)
Could be a problem with your torque converter
Take it back and get them to check it.