Also, for testing purposes, I'd suggest lowering the tire pressure by 10%
to see if there's any difference. BFG tires have stiff sidewalls (stiffer
than others) and when they get old they flex less. I can feel the
difference when I switch from BFG to General Grabber AT.

On Fri, Jun 18, 2021 at 6:40 AM Dan N <dn92610@gmail.com> wrote:

> 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
>>
>