i had an aftermarket stereo put in my 97 E420 and now the shift points are all goofy. the car is shaking and messed up!! they also took out the cell phone dash unit...is there any connection between the radio and trans controller? there has to be, it was fine before the install..

 

no maybe they disconnnected the battery and it might have caused some problem...maybe? i dont think the 2 are connected. just coincidence. did you wait to have it installed, or left the car with them?