82 300TD rear driver side sag
 

Just bought an 82 300TD. Rear is lower on driver side. I speculate that it is the self leveling system and have searched the forums here without coming up with a definitive course of action. Any advice?

Wish I could help you out but I haven't had the pleasure of working on my rear suspension yet. Sounds like you're looking in the right area though. I've got to compliment you on your taste in cars, the TD is just a beautiful automobile. Never thought I'd drive a station wagon, let alone a Diesel engined car, I'm a convert on both fronts.

Here are a couple more articles that may help you.
http://www.mbz.org/articles/body/leveling.html
http://www.mbz.org/articles/body/sphere.html

Bob D.