Quattro all-wheel drive system (Audi A4 B6)

1 - Engine
2 - Clutch
3 - Manual transmission
4 — Primary shaft of the gearbox
5 — Power take-off shaft
6 - Hollow shaft
7 - Front differential
8 - Torsen differential
9 — Cardan shaft
10 — Rear power take-off shaft
11 — Rear differential
I — 1st gear
II — 2nd gear
III — 3rd gear
IV - 4th gear
V — 5th gear
R — Reverse
A1 — Front main gear
A2 — Rear main gear
T — Speedometer drive

The AUDI A4 quattro has a permanent all-wheel drive. To drive the rear wheels, the following are additionally used: a cardan shaft, a rear axle differential, two rear wheel drive shafts, and a Torsen center differential.

The cardan shaft transmits torque from the front axle gearbox to the rear axle differential. From the rear axle differential, two drive shafts transmit movement to the rear wheels. To compensate for different wheel speeds and distribute torque between the front and rear axles, depending on driving conditions, all-wheel drive models are additionally equipped with a self-locking Torsen center differential, which can transmit variable torque to the front and rear wheels.

Towing Features

All-wheel drive models can be towed with the front or rear wheels raised.

Thus, however, the vehicle cannot be towed for a distance greater than 50 km and the towing speed must not exceed 50 km/h. The vehicle must be towed on a special transporter.