One thing the German's do best is over-engeneer things...this trans in the perfect example. The unit is fully adaptable to both driving style and wear within the unit and adjusts shift pressures as needed to opperate within it's given software parameters. Based on turbine shaft and output shaft speed, the controller monitors how long in milliseconds it takes to complete each gear shift compared to the specified shift timing and adapts shift solenoid duty cycling and line pressure as needed to meet the shift quality written into the software. Once wear or mods. performed on the trans excede what the trans can adapt to, the control unit assumes internal failure, sets troubled codes, and can enter limp mode...this means you have reverse, 2nd or 3rd depending on the year and application, and full line pressure. Under this condition, just putting the car in gear at idle will bark the tires...kind of cool for us gearheads. I can hook-up a scan tool to one of these cars and tell you just how worn each clutch pack is...the trans is simply too smart to have any fun with. While the 4L80e, 4L60e, 46RE, A4OD all electronicly control shift timing and line pressure, they still use accumulators to dampen apply rates...not so in the M-B units. The German's just had to show everyone just how smart they are. On a positive note, this is an excellent trans...the only problem they are known for is leaking around the electrical connector...two o-rings that take two minuets to replace.