Brand Name:
/
Model Number:
8HP70、8HP70H、8HP70X
Application: ZF 8HP series (likely 8HP45/55/70), supporting 2nd/4th/6th/8th gear ratios.
Design: Compound planetary set (Ravigneaux or Lepelletier type) with hardened 18–22 tooth sun gear and 42–46 tooth ring gear.
Material: Case-hardened 20MnCr5 steel (core hardness 58–62 HRC, surface >800 HV).
Critical Tolerances:
Backlash: 0.05–0.12mm (exceeding 0.15mm causes whine)
Runout limit: <0.03mm
Failure Modes:
Pitting/spalling (fatigue due to high torque cycling)
Bearing journal wear (if oil debris present)
Thermal distortion (if ATF exceeds 140°C)
Note: Requires ZF Lifeguard 8 fluid for proper lubrication. Common in Audi/BMW applications.
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