I agree with ajme.
I also rebuilt my transmission with no previous automatic transmission experience (mine is a 1995 E320 with 722.3 transmission). I used all genuine parts and had to replace most of the steels as well as some plastic parts. The total parts cost was close to $700. I also had to disassemble and clean the valve to get proper shifting. The best part is that I now have a very good understanding of how the transmission works and I would not hesitate to buy another benz at a bargain price that needs transmission work.