90 190E gas/auto transmission
 

I have a similiar issue with my merecdes also mine blows smoke out the tail pipe and then it will be fine but after a day or 2 my transmission level gets so low that it tough for the car to shift gears correctly i have to get the rpms around 2500-3000 high to even move the car, but when i add more fluid to the transmission the car goes fine until it smokes again then the process is all over again.
Got any ideas what it could be....? bad gasket, or or could be a crack in transmission case...? and how many quarts of fluid are rated for this type of transmission?

You need a new modulator valve for the transmission- the smoke is the trans fluid being sucked into the engine via the vacuum line.

90 190E gas/auto transmission
 

Thanks for the information do you happen to know where i can get the new modulator and how much it will cost...? also do u have happen to have a pictures of where the modulator goes on the transmission..?