Not sure about your syncro, but in my plain ol' GL, rumbling was caused by a
bad wheel bearing...

On Mon, Mar 23, 2009 at 9:55 PM, Mike Miller <mwmiller@cwnet.com> wrote:

> VAN Folks,
>
> At certain speeds, 45-65 MPH, there is a distinct rumble to be heard on
> almost all road surfaces [some road surfaces are so noisy they drown out
> other noises].
>
> Weird thing is it can only be heard from the drivers seat, not the
> passengers.
>
> 87 syncro with a decoupler. I've only tried it decoupled. I suppose I
> should
> couple it up and check that too.
>
> Does the front drive shaft rotate even when decoupled, driven by the front
> wheels?
>
> Mike
>

--
Jim
Wilmington, NC