The W5A 030 is basically the same transmission with an additional electrically controlled 5th gear overdrive section attached to the main body in a separate housing; it was available as an extra charge option.
All 4G-Tronics were succeeded by the more modern and economic 5G-Tronic (Type 722.6) transmission that features an integrated 5th gear overdrive ratio, torque converter lock-up and fully electronic control.
In some models it is calibrated to move off in second gear to reduce "creeping" and provide a smoother ride, selecting 1st only if the selector is in "2" or in case of abrupt acceleration.
In some V8 installations a small control unit activates the kick down solenoid when the brake pedal is released so that the car moves off in 1st gear.
[c] 5 forward gears[d] out of 11 main components[e][1][2] and the need of 2 housings[f] and 2 different controls[g] turn out the W5A 030 as the least economically designed automatic transmission ever manufactured for passenger cars.