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Old 08-03-2013, 09:58 PM
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whunter whunter is offline
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Location: Metro Detroit, Michigan
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Hmm

Quote:
Originally Posted by BenCohen-300TD View Post
Well, I've searched and searched, and there are lots of posts about grinding noises, but nothing that describes my situation:

1979 300TD non-tubo, 139,000mi. New (rebuilt) transmission shifts great.

When accelerating, at higher rpms, I SOMETIMES get a grinding noise that sounds, to me, like a bad bearing. The sound is correlated with the engine RPM, so I also hear it at highways speeds, but not all the time. I haven't heard it in a while, but my GF reportedly heard it driving on the highway earlier this week.

If it's a bad bearing, where could it be? Since it's correlated with engine speed and not wheel speed, it's sounding scary to me.

Any thoughts? Thanks everyone,

B
You need to mention that this is an automatic transmission.

My best guess:
* Exhaust making random hard contact.
* Failed mounts
* Loose torque converter bolts

.
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