Scott Paddock is on the ever elusive trail of a 5 speed
gearbox for the Van.

Ken Wilford had a couple of South African 5 speeds for
a good price the other day and I can also get the Euro
gearboxes for a slightly higher cost.  You will also need
to upgrade to the 5 speed shifter linkage (or so I have
heard) and it generally runs around $350 or so.

I can regear your 4 speed for several hundred less than
the 5 speed and it'll do just about what you wanted the
5 speed to do.  IMO the 5 speed might be a bit more
flexible with a stock engine's torque and horsepower band
but the final drive ratio can be the same with a regeared
4 speed.   Plus, with the 4 speed you don't have to swap
shift linkage over.

If you are dead set on the 5 speed then I'd post Ken a
note as the price he quoted was about the best I've seen
in a long time.

-Todd Hill
 VolksWerks Transaxles
 Olympia, WA