I have to ask you better define the noise.
A loud clacking noise would be a broken gear tooth (very unlikely).
A continuous whining noise is misaligned gear teeth, usually a result
of worn carrier bearings. This noise will change to quieter or
noisier going on or off throttle.
A cyclical rumbling sound that repeats 2 or 3 times a second
depending on road speed would be a worn wheel bearing.
If the worn bearing rumble is also accompanied by a slightly variable
whining sound, it might be a worn carrier bearing, but that sort of
wear is very unusual.
Barney Gaylord
1958 MGA with an attitude
http://MGAguru.com
At 10:22 PM 4/11/2012 -0500, Paul Root wrote:
>....
>With the top up, the noise from the rear end is more pronounced. It's also
>definitely louder on trailing throttle.
>
>I think it's coming from the rear left, so I'm guessing it's not the diff.
>Perhaps the exhaust?
>
>Does anyone have ideas? To me, it's not quite a grinding, but I don't know.
>....
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