S4 transmission prob?

[Dave Brady <brady@husc.harvard.edu>]

Greetings,

I've picked up '92 S4 with 73K, which seemed to be in excellent condition.
I'm now hearing, at infrequent intervals, a humming sound from the
transmission, which lasts a few seconds at a time.  The dealer tells me
that they've heard this before in others, and that it's not a problem.

While looking at EuroCarFinder's Registry, one '92 S4 owner wrote:

          Transmission replaced under warranty at 50K miles due to worn
          pinion bearings. Common amoung S4's according to dealer.

Can anyone alleviate my anxiety about this?

Thanks!

Dave