Thanks Dave. We'll see about the doughnuts some time this weekend :-)
> -----Original Message-----
> From: Dave Massey [mailto:email@example.com]
> Sent: Saturday, September 14, 2002 11:07 AM
> To: Hugh Fader
> Cc: 'Dave Massey'; '6pack'; 'triumphs'
> Subject: RE: Whine in gearbox or differential?
> Message text written by Hugh Fader
> >Hi Dave. I just got back from a test run listening closely
> to the pitch of
> the whine. It is definitely road speed related. I shifted
> 3-4-3-4 while
> coasting and the whine stayed the same. Here's another
> condition where I
> hear the sound: If I'm in neutral, coasting, and move the
> shifter almost
> into gear with the clutch disengaged, I begin to hear a
> quieter whine with
> the same pitch. This is accompanied by the jingle sound I
> mentioned in an
> earlier post.
> I'm getting more confused. I guess that shifting into gear
> even with the
> clutch disengaged puts a small load on the differential. But
> I don't have
> explanation for the jingle sound just yet.
> Another question: Since the main shaft speed also varies with
> road speed,
> couldn't my noise be coming from it's gears?
> Maybe I'll muster up the courage to try Bill Wellbaum's suggestion of
> running the car up on 4 jack stands and getting under to listen.
> When you are in neutral with the clutch depressed the clutch
> disk is either
> stopped or turning very slowly. When you move the shifter
> towards a gear
> you engage the synchro ring which will spin up the clutch
> disk (and all the
> gears associated with the gear selected) which puts a load on the
> differential. And the oil in the gearbox will offer up
> resistance to the
> gears turning which also loads the differential.
> Don't forget that when the gearbox is in fouth the input
> shaft is connected
> directly to the output shaft and there are no gears loaded to
> cause a whine
> that would change with load.
> You may have to get a helper to work the gas and clutch while
> you are under
> there but I'll still bet $10.00 to a doughnut (adjusted for
> inflation) that
> it is the diff. That should be a comfort because a diff repair (or
> replace) is less trouble and money than a transmission.
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