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RE: Whine in gearbox or differential?

To: "'Dave Massey'" <105671.471@compuserve.com>
Subject: RE: Whine in gearbox or differential?
From: Hugh Fader <hfader@usa.net>
Date: Sat, 14 Sep 2002 13:25:50 -0400
Cc: "'6pack'" <6pack@autox.team.net>, "'triumphs'" <triumphs@autox.team.net>
Thanks Dave. We'll see about the doughnuts some time this weekend :-)

- Hugh

> -----Original Message-----
> From: Dave Massey [mailto:105671.471@compuserve.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
> an
> 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.
> 
> Cheers
> 
> Dave

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