2005 Ford F-150 - Shakes

steering wheel shakes intermittently when driving. Just changed serpentine belt and smooth pulley and replaced antifreeze.

My first response would be to have the front tires looked at. How old (years/miles) are they? You could have a wheel out of balance. Hard to tell over the interwebz. Have a good independent shop look it over.

They are just about wore out. It worked before I changed the serpentine belt. I will try with airing the tires up.

If your tires are in bad shape you need to do more than just put air in them. I suspect your problem is unrelated to the serpentine belt and it’s coincidental.