Sounds like a dry/bad CV joint- probably at the wheel rather than the
trans.  Check to see if its boot is cracked and the joint thereby dried out
(no grease) or if it is just worn out.  Pretty simple replacement
procedure- good luck!
        Shawn- various Vanagon Westies

>I thought I might inquire of those of you who are so well versed in
>troubleshooting over the internet.
>
>Mine is an 81 transporter, 200K +
>
>When moving at very slow speeds, like in a parking lot, or looking for
>that perfect camp site, I sometimes hear a noise that appears to come from
>the left rear wheel. The sound is just as if there is a marble inside the
>hub cap. Clink, clink, and the rate increases and decreases with the
>speed. It is so pronounced that as I slow down, the clink slows in rythmn,
>and as I come to a stop, I get the one.... last...... clink. Just like if
>it was a marble :)
>
>If its there as driving speeds, I cannot hear it. I assume it is, but the
>road noises make it impossible to tell. It is not always there, usually
>after a long drive. I took the wheel off and checked the bearings for
>slop, and looked for anything obvious and found nothing unusual. I have
>not put the whole beast on jackstands and turned the wheels freely. Maybe
>over the weekend.
>
>I am just wondering if anyone more familiar than I am with the transaxle
>might want to venture a guess, or give me something I could test.
>
>Much obliged for any advice.
>
>Regards from Utah,
>
>John

             Imua Camper Company, Hawaii,  http://www.imua-tour.com
         Volkswagen Westfalia camper rentals in the Hawaiian Islands
                               ph/fax-(808)935-6241