The front and rear gaps are about the same 7 5 7 8mm.
Vanagon sliding door adjustment.
Next open the door and support it working in my carport i used some tires when i work on the sliding door i use my floor jack under the sill this also allows for adjustment of the door for final assembly.
The hardest part of the whole process was getting the sliding door track cover off.
A picture woudl be helpful.
I have an 81 vanagon.
Are the gaps in front and back with the door closed about the same width.
Front of sliding door fits flush with front.
To fix your van door and make it open smoothly get some spray oil like tri flow and spray oil on all the rollers top middle and bottom.
All sliding doors 85 and up use the same rear mechanism.
Once the rollers on.
Is it leaking at the back.
I have an 86 vanagon sliding door that has always had trouble closing staying closed.
After that door removal itself is pretty easy with a helper.
Good thing i was repainting that cover anyway.
Currently it has a good flush alignment in the front but the rear sticks out around 15mm from the body panel.
To move the door more forward or backward there is one bolt behind the interior door panel that lets you adjust the fore aft position a bit.
Most minivans use a similar system.
Would love to have some advice.
Those would 2 different adjustments.
The placement in the door and the hinge is differnet than the one in the pictures.