My 1981 MBZ 123 240D 4-spd manual transmission is stuck in first gear and I can't get it to shift to another gear or neutral! The trans has always been smooth and I don't know how to troubleshoot what might be the problem. Is there maybe an easy fix with the linkage? I had backed out of my driveway using reverse. I then shifted into 1st gear and now it is stuck in first gear. The interior shift lever doesn't seem to be able to shift to any other gear.

Jim.....