- - - 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:
      1. Backlash: 0.08-0.12mm (requires dial indicator)
      2. 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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