Have you checked the rear axle fluid level lately?  I would recommend a 
check of the tranny fluid level too.
On Oct 29, 12:46pm, chuckc wrote:
> Subject: ARRGGHHH!!! Not Another $%&^ Noise !
> Outa the clear blue ... just started happening
> the other day ... driving me crazy!!!
> 
> Sounds sorta like a deep, sorta rhythmic hum
> (like hmmm ommm or ummm).
> 
> Happens only when moving 
> 
> At some speds, louder than the exhaust.
> 
> Almost sounds like someone's following too close.
> 
> I'm gonna do the standard checks this weekend, back wheels
> off the ground and all. The only think I can think of
> is that I retorqed the front wheel bearings about
> 2 weeks ago. Sounds more like road/tire noise.
> 
> What can it be?
> 
> 
> chuck
>-- End of excerpt from chuckc
-- 
Curtis Carlson
'66 Austin Healey Sprite MkIII ("Gerty")
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