Have you had the front shocks changed recently ? If so or not check the lower shock bolts and make sure they are TIGHT. 
   

                                Stacy

Sent from my iPhone

> On Oct 14, 2015, at 10:32 PM, john <john@JHL.MGACOXMAIL.COM> wrote:
> 
> I am getting intermittent "clunk" from under middle of van
> while driving.  '84 Vanagon, 1.9L engine, automatic
> transmission.  "Clunk" not associates with turning as would
> happen with CV problem.
> 
> Increasing occurrences of the"clunk."  Nothing obvious under
> van.  Had my Son jump up and down on front bumper while I
> locked at front suspension with wheels first turned full
> right and then full left. Nothing appeared loose.
> 
> Got under middle of van.  Tried to push up on gas tank.
> Seemed secure.
> 
> Had Son drive van to end of driveway where the curb drops
> off more than most driveways would.  Had him run van back
> and forth over drop off.  No clunk.
> 
> Any ideas where I should look next?
> 
> Thank you,
> 
> John