You're going to have trouble looking for a source for a transfer case, since
a vanagon syncro doesn't have one.
The ringing noise you hear is most likely coming from the driveshaft and not
the front differential.  Many driveshafts ring like that when they engage
and transfer power.  It's not a signal of imminent failure.  If it bothers
you, install a new driveshaft and the problem should go away.  Do you get a
pronounced vibration between about 35 and 50 mph?  If so, the driveshaft is
worn out and needs replacing or rebuilding anyway.

-Hans
East Coast Vanagon
http://www.vanaru.com

----- Original Message -----
From: "SKP" <skp@ONSHAKYGROUND.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Friday, December 01, 2006 5:12 PM
Subject: Front Transfer case on an 87 Syncro

> Hi All,
>
> My local mechanic says the front transfer case is going out after we
> took it in because of some clanking noises we heard coming from the
> drive line.
>
> He doesn't know of any good sources for new or rebuilt Syncro
> transfer cases.
>
> Local in the SF bay area would be best,  but we are open to a
> reliable source in the US.
>
> Any help would be appreciated.
>
> Kevin
>