ON ALL 1999 M.B.'S THE TRANSMISSIONS HAVE ELECTRONIC CONTROLS THAT ADAPT TO YOUR STYLE OF DRIVING. THESE CONTROLS CAN ADAPT TO VARIOUS PERSONS & THEIR OWN STYLE OF DRIVING.IF A PERSON DRIVES THE CAR HARD THE TRANSMISSION WILL FIRM UP THE SHIFTS, & LIKEWISE EASY DRIVING WILL ALLOW TRANS TO SHIFT SOFTLY. IF YOU LET OFF OF GAS PEDAL DURING ANY SHIFTS THEN THE TRANS WILL GIVE YOU THAT "RUBBER BAND" FEELING.