Loose shock bolt.   Axle nut (big one in center of wheel). 

Karl Wolz
Sent from my electronic umbilicus

On Jan 30, 2013, at 9:53 AM, Jeff <vw.doka@GMAIL.COM> wrote:

> Arlene,
> 
> Check the springs.  I've had this type of noise on a few vans that had
> a broken rear spring.  Look closely though.  The break is not always
> obvious.
> 
> Cheers,
> 
> Jeff
> 
> 
> On Wed, Jan 30, 2013 at 7:31 AM, Arlene K Sondergaard <asonder@usgs.gov> wrote:
>> On the freeway this morning the passenger side rear wheel clunked like I
>> hit a rock.
>> It happened 2 more times.
>> Got off freeway to look at tire.
>> Pressure around 45, tire looks normal grab and shake-no give.
>> The belts look OK.
>> Drive the backroad the rest of the way to work for lower speeds and it
>> happened  a couple more times.
>> What can be going on?
>> 
>> Thanks,
>> 
>> Arlene
>> Wolfsburg 1987 Van