Not that this will answer any, let alone all your questions, it's a good resource of what's on each model/year:
http://www.vanagon.com/info/years/
 
Sniff around that area of the Vanagon.com site and you'll likely find more specific info.
 
Bob> I'm looking at a slight update from my '84 to an '87. It's in pretty good> shape, except for the left rear fiberglass bumper is damaged. Are there> any common foibles of these models? This has factory air in a ceiling> tunnel and the 2.1/4spd combo.> > Thanks for any pointers,> Gregory Smith> Olympia, WA
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