PS2CHO...I found a guy down the highway here that only does MB Transmissions (The "Transmeister"!). I had already checked out your DIY and was going to try myself but he's not far from the repair shop where they are doing my engine. He said to call him when it's out and he will go get it and bring it back to his shop and check it out. Told me that the disks are a common problem and shouldn't be much to fix if that's all it needs. I'm hoping that's it because it shifts great normally. I told him it makes a "clickety" sound when backing up and he said it is usually just those b3 friction plates (discs). Crossing my fingers!