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Full-time all wheel drive system with torque distribution 31/69% front to rear. Three differential system using computer-controlled hydraulic clutches (Porsche Dynamische Allrad Steuerung or PDAS for short) to help distribute power to the four wheels.

Figure: porsche 911 carrera 4 964

Figure: Porsche 911 Carrera 4 964 center differential with a multi-plate differential locking clutch

Figure: porsche 911 carrera 4 964 gearbox

Figure: porsche 911 carrera 4 964 gearbox rear differential

Figure: porsche 911 carrera 4 964 rear drive shaft

Figure: porsche 911 carrera 4 964 distributor housing

Figure: porsche 911 carrera 4 964 central tube

Figure: porsche 911 carrera 4 964 front differential housing

Figure: porsche 911 carrera 4 964 front differential

Figure: porsche 911 carrera 4 964 front drive shaft

Automatic all wheel drive. Mechanical limited slip at rear, viscous coupling in the center.

Figure: porsche 911 carrera 4s 993

Figure: porsche 911 carrera 4s 993 transmission

Figure: porsche 911 carrera 4s 993 rear drive shaft

Figure: porsche 911 carrera 4s 993 viscous coupling

Figure: porsche 911 carrera 4s 993 central tube

Figure: porsche 911 carrera 4s 993 front differential

Figure: porsche 911 carrera 4s 993 front drive shaft

Automatic all wheel drive. Viscous coupling just behind front differential, transferring from 5 to 40 % up front.

permanently locked multi-plate hydraulic clutch in the center. Unlocked only if turning at low speed, for example while parking. Torque distribution in this vehicle is adjusted even before wheelspin occurs. Gathering information from numerous sensors (i.e. g force sensor, accelerator pedal position, speed, and even turbo pressure) while accelerating, computer changes normal 40front/60back torque split, sending up yo 80% to the rear wheels, even if all four wheels are rotating with the same speed.

Figure: porsche 959

Full-time all wheel drive. 38/62 torque split under normal conditions. Multiplate clutch lockable center differential. (?)

Figure: porsche cayenne first generation