My van does it sometimes.  I just reach under and shake the shaft from side
to side and it will go away for a long time.  Now it did not happen for six
month.
Zoltan
----- Original Message -----
From: "Spencer Allen" <SPENCERVW@AOL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Thursday, August 12, 2004 7:08 PM
Subject: bad cv knocks going straight?

> This past weekend my 85 Westy developed a heavy knock at the r/r wheel. I
> suspect a bad CV. The knock slows and speeds according to the bus speed.
It
> knocks when going straight I thought CVs knock only on turning. Turning
actually
> quiets it down. Can these things be saved? Can (or should) you add grease
> through the boot from time to time? If it is bad is it cheaper and faster
to replace
> the half shaft? Thanks all.
> Spencer
>