How many Hours for a W123 300D Automatic Trans rebuild? Mine works great now and shift smoothly and has just been flushed, but my previous one just literally died suddenly and inexplicably in the driveway! This the week after a dash fire, two weeks after a complete motor replacement, and new windshield. Geez what a summer that was, I had to replace the transmission and solder 100 splices to make a new harness.............50K and anew paint job and interior since I did that