vibration in front end

Your first step to try and determine the cause of the vibration in the front end of your 2004 Chevrolet Impala would be to check those two new "used" tires for proper balance. While the the wheels and tires are spinning on the tire balance machine be sure to look for bent wheels and separation issues with the tires. If everything checks out ok try rotating the tires front to rear to see if the vibration moves to the rear.

I just looked at the same problem right now.And to me it looks like worn tie rod ends.No big deal to replace.The car same as yours vibrates at 60 mph.When you move the steering wheel back and forth there is play between the tie rod ends.Actually both sides.And may be a combination of the rack and pinion steering gear,( wearing a bit as well).

cv axels need to be replaced