I just picked up an 82 300SD turbo automatic. This is my first mercedes so I am not too familiar with their layouts. The previous owner did not have the manuals for it still.
The problem is that the transmission is operating extremely poorly. It will shift from 1st to 2nd gear with no trouble, but it will not shift into any higher gears. It will not shift even if I push it up to 5000+ rpms and keep it there.
I would like to check the transmission oil and the lines, etc., but I'm not sure how to go about doing this on this car (on my Volvo, for instance, there's a dipstick for the transmission fluid, but I did not see one here). Any advice on how to check these things and what other things I should look at?