finback670

Well, it's done. I think both front wheel bearings were bad. It got quieter at low speed after replacing the right side hub, but the high speed hum was still there. Replaced the left side today. Old one made a scraping sound when spun. Test drive...no more hum!!!

I saw from another post that a shudder when starting and turning from a stop is a rear differential problem and a TSB is out for it. Coincidentally, the Ford dealership just replaced my rear differential seals just before I noticed the shudder. When I looked at the repair bill, I saw that they replaced the fluid but there's no indication that they added any "friction modifier." I will pick up a tube this afternoon and add it myself.

This forum is a great tool and your knowledgable responses are much appreciated. I never would have known about the shudder if not for your forum!!!