I looked under my truck because my steering is acting funky, so I had my girlfriend turn the wheel left and right while in Park and I noticed my track bar moving a good 2 inches. This might be a silly question, but is this normal?

 

Nope. Sure isn't. Time for a new one. The axle/trackbar should move at all just turning the wheels in place.

 

get one with a lifetime warranty and keep the receipt so when it wears out in 2 more years you get a free one.

 

Ya, I went to Autozone and bought a Duralast one with a lifetime warranty for $150

 

It is normal if you have worn out bushings in it.