Patrick,

What does the diff/pinion bearing sound like when it starts to go? I have a whine that changes pitch with vehicle speed but does not change on accels or decels. When the diff went out on my Aerostar, it was a high pitch that would dissapear when you let off the gas. My 190E whine is not a real high pitch but does go away when making right turns. I was thinking is ia the right wheel bearing. I can't distinguish from the sound where the sound is coming from, just that it is behind me somewhere.

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Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)