Yes, it could be the tire's temperature related issue. I have an ML430 SUV
that gives small vibrations or harsh rides when the tires are cold... After
about 10 miles, it's smooth as nothing ever happened... and this happens
with new tires too. The sensation is similar to unbalanced tires or flat
spots.

On Fri, Jun 18, 2021 at 6:27 AM Skip Laubach <skiplaubach@gmail.com> wrote:

> Thanks for the tire ideas!  Trying to narrow things down. Tires are 14”
> BFG’s, maybe 8 years old, 30,000 miles.
>
> I’ll take a close look at the tires.
>
> Skip
>
> Sent from my iPhone
>
> > On Jun 18, 2021, at 7:39 AM, Dan Lamb <vanagongramps@gmail.com> wrote:
> >
> > Maybe tire has flat spot til warms up?
> >
> > Sent from my iPhone
> >
> >> On Jun 17, 2021, at 9:37 PM, Dan N <dn92610@gmail.com> wrote:
> >>
> >> Engine and transmission mounts?
> >>
> >>>> On Thu, Jun 17, 2021 at 6:55 PM Skip Laubach <skiplaubach@gmail.com>
> wrote:
> >>>
> >>> ‘84 Westy, new 944(?) CV’s.
> >>>
> >>> I have been using the Van as a daily driver for the last week (25
> min/15
> >>> mile commute).  During the first 5 miles a noticeable bump, bump sound
> >>> eminates from the rear of the vehicle. Not sure if it’s the CV’s, an
> axle
> >>> bearing, or otherwise. Only occurs when the van is moving so don’t
> believe
> >>> it’s the engine, but maybe? The bump, bump sound kind of dissipates
> after a
> >>> bit of driving. Thought maybe others have experienced same?  Please
> advice
> >>> and thanks!  Long time subscriber/infrequent contributor (but that may
> >>> change).
> >>>
> >>> Skip (northern Illinois)
> >>>
> >>> Sent from my iPhone
>