I had this happen to me on a '70 Olds 98 LS, it turned out to be a plugged tranny vent. As the transmision heated, the only way for the expanding air to get out was through the dipstick tube. On this Olds, it spewed on to the exhaust manifold.
I'd say, checking for a pluged vent would be a good starting point. Never had an auto Vanagon, so I don't know where the vent is, I'm guessing it's on top of the tranny, (where else would they put it?).

Andrew
1984 Westy "Speed Bump"
1996 VW Jetta Trek  "Little Beep" (the wife's car)
The Basket Bus  http://www.creativegifts2go.com/vw.html

--- brian Honan <cartruckbus@HOTMAIL.COM> wrote:
>Hi folks,
>
>      Back on the list again I get bumped off from time to time I don't know
>why. As the title says there is transmision fluid spewing out of the dip
>stick filler spot. The van is an 87 Gl atomatic. It would seem as though I
>over filled it but I check it after 11 miles of running and it will be at
>level. It seems to happen when it first starts running ? has anyone ever
>heard of this ? Could it be comming out of somewhere else and leaving a
>puttle to smoke on the top of the engine ?
>
>Brian
>
>
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