My e-revo brushless edition build

I hooked up the batteries today to make sure everything worked right and it does except for one thing.

I have it on it's back while doing this.....While giving it some throttle (forward or reverse) it gets this jerkiness like something is catching or dragging when I turn the steering to the stops, left or right...it's smooth when the steering is straight and all the way up too about 85% of maximum throw.
When I have it turned off and turn the steering to the stops and then rotate the tires they spin smoothly, I just can't see anything that would be causing the jerkiness when on throttle and turned fully left or right.

I'm hoping someone has seen this problem and knows what is causing it?