I just bought an 83 300D Turbo. It came with a rebuilt transmission among other repairs. I've only been driving it for about three days.
Here's when it shifts. It goes into 2nd around 15mph, 3rd around the low 20's and then 4th as soon as the late 20's then does not shift again no matter how fast I go. It runs strong. The engine has 180k on it. This is normal driving, not punching it. This also happens in about 5-6 seconds. Seems very quick. Is 4th gear made to run from 30mph all the way up to 90mph?
My question is if those are the correct intervals. It seems to be revving pretty high when I get over 50 mph but I'm starting to think that might be normal for these cars. I've ran it at 80 and 90mph and it seems to be fine. I've found some posts that touch on the subject but in reference to other issues. I migh be fine but I don't have any experience to know.