<VV> RE: [fastvair] Diff problem diagnosis help needed

Sat Mar 5 12:37:58 EST 2005

It's not in the Tech Guide, but I believe somewhere along the way there was
a recommendation to add an oiling hole to the pinion shaft to help improve
lubrication within the shaft and address this issue.

Anybody know where it can be found?

Regards,
Joel

-----Original Message-----
From: Tom Stark [mailto:64vair at absolutetops.com]
Sent: Saturday, March 05, 2005 9:28 AM
To: fastvair at yahoogroups.com
Subject: RE: [fastvair] Diff problem diagnosis help needed

I was a little surprised myself at the wear on some of these shafts.  I am
HOPING the one in my car is OK.  I am changing my gear soon, so I can check.
I just do not feel like buying a new shaft just yet.  too man other things
to spend my money on.  Even if it is a bit worn, I can let it go as I am
going to change gears again next year.  I am hoping to have the money for
the good aftermarket shaft at that time.
Tom

-----Original Message-----
From: Western Canada CORSA [mailto:westerncanadacorsa at shaw.ca]
Sent: Saturday, March 05, 2005 12:05 PM
To: fastvair at yahoogroups.com
Subject: RE: [fastvair] Diff problem diagnosis help needed

Was it a brand new pinion shaft when they made the 4spider diff?

I had an entire diff rebuilt, with the exception of the pinion shaft, and
learned about this problem on my first test drive.  It of course required
dropping the entire drivetrain.... again!

Regards,
Joel

-----Original Message-----
From: Tim Purcell [mailto:aircooled at lycos.com]
Sent: Saturday, March 05, 2005 12:35 AM
To: fastvair at yahoogroups.com
Subject: RE: [fastvair] Diff problem diagnosis help needed

Joel,

  Would you care to guess at a cause for this? (what causes the "beating",
lose fit?, vibration? etc.) This car has the T5 5-speed conversion, so now I
am a bit worried that there may be some mismatch with the transmission
output shaft.  I really do not drive this car that hard, but it does see a
bit of power now and then.

  Thanks for the info,
    Tim

----- Original Message -----
From: "Western Canada CORSA" <westerncanadacorsa at shaw.ca>
To: fastvair at yahoogroups.com
Subject: RE: [fastvair] Diff problem diagnosis help needed
Date: Fri, 04 Mar 2005 22:23:29 -0800

>
> Tim,
>
> My car did exactly the same thing as you are describing, and in my case it
> was the excessive wear on the pinion splines.  The get beaten into an "L"
> shape and the clunk is the transmission output shaft splines slipping on
the
> off the foot of the "L".
>
> Regards,
> Joel
>
> -----Original Message-----
> From: Tim Purcell [mailto:aircooled at lycos.com]
> Sent: Friday, March 04, 2005 9:06 PM
> To: fastvair
> Subject: [fastvair] Diff problem diagnosis help needed
>
>
>
> I think I may have a differential problem, or not, here is the info:
>
>      - Car makes a "clunk" when going from deceleration to acceleration
> (kind of like what you would expect from a bad u-joint).  I
> originally noticed when backing out of the garage, thought is was
> clutch, but noticed car would move a little then clunk.
>
>      - Clunk can be replicated by putting car in gear and rolling it
> back and forth.  ONLY does sound when rolled forward after being
> rolled back.  It will make this noise in all gears including reverse (same
> directions).  Spinning wheels with car in the air creates no noise.  How
> much lash (how far should you be able to turn the wheels) with the car in
> gear?
>
>      - U-Joints appear fine, sound and feel is very hard to localize,
> but can be felt in both wheels and driveshafts, but not on the body
> of the diff or trans.  Cannot really be brakes, since it only does it
> in gear.
>
>      - Differential in a 65+ design in a late coupe and was rebuilt with
> 4 spiders and a 4.08 ring gear and is using synthetic gear oil (probably
> 10,000 mile on it, no drag racing).
>
>
>       Any ideas?  Heard of this before?  Can't really be the spiders,
> but it doesn't seem like a typical diff problem to me.  If nothing
> else, I will probably try taking the left half shaft off and inspect
> the u-joints there (I already did the right, and the left inner
> u-joint was recently replaced, maybe a bad replacement).
>
>       Thanks for any ideas / help you can provide,
>         Tim Purcell
> --
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