Thanks to all who responded on my query re: soundproofing. I've got another
question for y'all:

Lately, I have noticed a disturbing symptom when I back off nearly
completely on the accelerator (so that I'm in the lower end of the RPM
range): the van "lurches" forward, sort of like what happens when you let
the clutch out too quickly. This leads me to think that the culprit may be
the clutch (brilliant, eh?), Or does this indicate a (hopefully less-costly)
problem?

--
Ray Reinhard