On my 83 300D turbo.
What kind and how severe of a vibration would a loose rear wheel bearing have. I have a high frequency vibration that comes in about 35 to40 mph and gets really bad about 60 to 65 mph then decreases after 70 mph. I thought that I might have an out of round tire, but I can't find any slipped belts. Could a flex disc cause this. After about 60 miles of highway driving it will get so bad that I can hear the exhaust banging something. There has been a slight bit of slack in the right rear wheel bearing since I have had the car. I never had it replaced because it never made any noise. The axle boots are not leaking so I assume the CV joints are ok. I need to find this problem, mywife is getting afraid to drive it.

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Keith Schuster
2006 E350 98K miles
2013 Ford Explorer 15K miles