Robert, my 82 vanagon diesel does the same thing you speak of. It pulsates
at the frequency that the wheels are turning. The shutter dissapates after
a longer trip (more than an 1/2 hr) and resurfaces with a cold van. I
think the joints are dried up?  I'm planning to pull off the driveshafts.
clean em up and do a liberal re-grease. My joints don't make any noise,
just this driveline shudder....can't be a tire, the lump would't go away.
I've also read about flipping the driveshafts to reverse the wear. We'll
see if this helps soon.  Joel Hembel '82 Westy Diesel

ROBERT A COPICH wrote:

> I am familiar with the click sound that can come from cv joints going
> bad (mine have been clicking for years) Has anyone out there ever
> experienced a pulsing in acceleration?  The frequency of the pulse
> matches the frequency of the wheels rotation?  This has baffled me for
> months!!
>
> Could it be a problem with the transmission?
>
> any help, greatly appreciated
>
> Opie