I just bought a 2004 ext cab f-150, and it had only 18,000 on it.

I just started to do this, when I take a corner, my truck shakes? Its not every corner, but about 90% of the time it does. It kinda feels like the front end is shaking, but im not sure. I took a look under to see if i could see anything, and everything looks fine.

Just wondering if anyone has this problem??

thanks for any help!!