Like Kaleb said the rear end or possibly the sun gear in the
transmission. On mine it's the sun gear so when the fluid gets
just about 1/2 qt low it will start to whine. I'm saving for a
new tranny.
I am also still looking for another 123 300TD for my daughter so
she will stop trying to get mine. She loves the way those wagons
look. If you decide to sell yours let me know.
Manfred
Date: Sat, 13 Aug 2011 23:43:05 -0500
Subject: Re: [MBZ] Unexplained whining noise in my W123 300TD
The rear end is worn out
Sent from my iPhone
On Aug 13, 2011, at 11:37 PM, andrew strasfogel
<astrasfo...@gmail.com> wrote:
> Today I heard the onset of a very prominent whining noise in
my 300TD that
> gets louder under load. Seems to come from the rear but not
100 percent
> certain. It gets VERY loud going up hills, accompanied by an
ominous
> grinding sound under load while driving uphill. The whining
varies in pitch
> that roughly matches engine/car speed. We made it home OK but
I am really
> spooked and unwilling to drive it again without a consensus
diagnosis from
> the network of experts out there. SWMBO thinks it's the
differential - does
> this jive with the symptoms? Rear axle? Driveshaft? U joint
bearing??
> Gear in the transmission (although the shifting is smooth with
no flaring
> or slipping). I should also add that all fluid levels are
normal and the
> transmission fluid is red and clean, not burnt.
>
> Andrew
> 1983 and 1985 300TDs
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