At 09:21 AM 6/13/2010, Jack R. wrote:
>the van.  There is, however, a correlation between the noise and
>acceleration.

Can you expand on that correlation?  Also range of frequency, range
of duration, does frequency change during one instance und so
weiter.  Audio recording possible?  Can you duplicate it with van
chocked, or with van up on stands?

Most important, have you used a mechanic's stethoscope to track
it?  If not, strongly suggest doing so.

Yours,
David