After reading this thread: http://www.vicious1.com/forum/topic/different-problems-on-the-three-axes-including-the-z-buzz-dive/
I believe that voltage is the issue, but I need to get a multimeter to be sure.
My earlier post said that the motor made a grind sound. It is much more of a buzz than grind and IS NOT the same as the deep grind it makes when something restricts the steppers movement. This is part of the reason why I think the voltage may be the issue. I also loosened the anti backlash nut as per the thread linked above. It definitely helped some.
I will update again after changing voltage.