Brand Name:
Audi
Model Number:
/
Function: Transfers Quattro AWD torque to rear wheels via crown wheel/pinion (4.25:1 ratio) with integrated electronic differential lock.
Key Features:
Hypoid Gearset: Case-hardened steel (HRC 60+) with lapped contact pattern
Haldex Coupling: Gen 5 multi-plate clutch (0-100% rear bias)
Thermal Management: Temperature sensor triggers cooling protocol (>250°F)
Failure Modes:
Bearing Pitting: Contaminated fluid (G 055 529 A2) causes whine
Clutch Pack Wear: Leads to AWD disengagement (P189C codes)
Seal Leaks: Differential fluid migrates to Haldex unit
Critical Specs:
Backlash: 0.08-0.12mm (requires dial indicator)
Pinion preload: 1.2-1.8 Nm rotational torque
Pro Tip: Perform adaptation reset via ODIS after service – prevents false "AWD malfunction" warnings.
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