I just bought a 1976 300d. The engine fires right up without a problem. The odometer reads 31000 miles but I think it has rolled over once maybe twice because the car is in pretty good condition. When I tried to put the transmission into gear nothing happened. I tried every gear and pressed the accelerator nothing happened other that the engine revving. I checked the transmission fluid it seemed like it had the right amount of fluid in it. The man I bought it from said that he bought it two years ago drove it home about 50 miles the transmission shifted fine then the next day wouldn't go into gear and parked it. Been sitting since with the occasional cranking up to keep the engine in good shape. I find it hard to believe that the entire transmission failed completely. Could someone give me an idea on what I've gotten myself into?