'99 ML430 101Kmi with no major issues 1-4.

Just changed the trans fluid (all MB parts and fluids) and now it shifts hard out of first when it is cold. How much does it cost to have the transmission replaced or rebuilt (just in case)?
I am on my second set of window switches. I don't mind the nagging cheap and easy fixes like that but am a little worried about the transmission as I have about 40K miles of towing a 5K# boat.

Loren