Brand Name:
AUDI
Model Number:
8HP-55A;0BK
Key Features:
Material: High-strength cast steel/aluminum alloy for thermal stability
Design: Precision-machined splines for 6 friction plate engagement
Function: Direct clutch pack force transmission in 3rd/5th/7th gears
Critical Specs:
142-148mm OD with 72±0.02µm surface finish
Heat-treated to 58-62 HRC
Failure Modes:
Spline wear (>0.15mm play)
Heat checking at >250°C
Microfractures in casting voids
Performance Note: Upgraded from 8HP45 with 20% increased torque capacity (550Nm) through reinforced ribbing. Requires ZF Lifeguard8 fluid for proper plate clearance (0.4-0.6mm).
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