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The Audi V8 had two different permanent four-wheel drive systems.
Audi V8’s with the automatic transmission had a four-speed ZF 4HP24 automatic gearbox with integrated drive (transaxle), no transfer case.
The ZF gearbox’s integrated drive was one-speed single range and used a center differential with multi-disc clutch pack.
The rear differential used an American TORSEN (TORque SENsing) Type 1 torque biasing differential.
Audi V8’s with the manual gearbox used another TORSEN Type 1 differential for the center differential.
Audi V8’s with the automatic transmission had a four-speed ZF 4HP24 automatic gearbox with integrated drive (transaxle), no transfer case.
The ZF gearbox’s integrated drive was one-speed single range and used a center differential with multi-disc clutch pack.
The rear differential used an American TORSEN (TORque SENsing) Type 1 torque biasing differential.
Audi V8’s with the manual gearbox used another TORSEN Type 1 differential for the center differential.