Brand Name:
Volkswagen Passat
Model Number:
09G 09M 09K AWTF60SN
The drum clutch assembly is a core torque transfer unit in modern automatics (especially planetary-based designs). Key points:
Function – Houses stacked friction/steel plates activated hydraulically to lock planetary gearset elements.
Critical Parts – Drum body, apply piston, seals, return springs, and splined hubs (input/output connections).
Failure Modes
Drum cracks: Stress fatigue near weld seams or splines.
Seal leaks: Causes slow engagement (delayed shifts).
Plate wear: Glazing/burnt material leads to slippage (P0776 codes).
Inspection – Check drum for scoring/ovalization; measure plate clearance (exceeding 1.5mm requires pack replacement).
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