When I am driving and get to about 30 MPH the whole front end of my car begins to shake. The dash board and, steering wheel. It will becomes less noticable when I get to 55 MPH. And now when I slow down to about 10-15 MPH there is a knocking noise coming from the right passenger side tire. What could that be?

Hello, There are a lot of moving parts in the front end. You may have a bad CV joint which is on the shaft that turns the front wheels. Each side has a similar part. There are also hub bearings which are in the hub and the hub is turned by the CV joint shaft.

The CV joint can break without tearing the rubber cover on the shaft, but if someone looks under the car at the CV shaft and sees oil or grease or a torn rubber cover on the right side CV shaft; it will confirm the diagnosis.

Once this part breaks the car will not move anymore. A broken CV joint can cause other parts to fail like the hub bearings. You can call around and price the repair or if you know someone who can do the work, price the parts.

If the shaft needs to be removed, it is behind several parts which will need to be removed first.

Get the front wheels balanced

Very not good could be driving shaft and can be dangerous