68412063AA Jeep Grand Cherokee 5.7L 8HP70 Transmission

The automatic transmission assembly with reference numbers 68412063AA, R8412063AA, and 68218925AB is designed for the ZF 8HP70 (Mopar DFD) 8-speed automatic transmission. This heavy-duty longitudinal unit features four planetary gearsets, integrated Mechatronics electronic control, and a lock-up torque converter, delivering rapid shifting and high towing capability for the Jeep Grand Cherokee WK2 and related platforms.

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Quick Specifications:
• Part Numbers: 68412063AA / R8412063AA / 68218925AB
• Transmission Model: 8HP70 / DFD (8-Speed Automatic)
• Configuration: Longitudinal 4WD / AWD
• Max Input Torque: Up to 700 Nm
• Fluid Type: ZF LifeguardFluid 8 / Mopar 8&9 Speed ATF (68218925AA)

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Applications:
• Jeep Grand Cherokee WK2 (2014-2021, 5.7L HEMI V8 & 3.0L EcoDiesel V6 variants)
• Dodge Durango (2014-2021, 5.7L HEMI V8 variants)

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Complete Assembly Includes:
✅ Transmission case with heavy-duty 8-speed planetary gear train
✅ Torque converter with multi-disc lock-up clutch
✅ Integrated Mechatronics unit (valve body, solenoids, and TCM)
✅ Internal oil pump, filter pan assembly, and multi-plate clutch packs
✅ Speed sensors and sealing gaskets

Note: Mounts, shift cables, external cooler lines, transfer case, and wiring adapters may need to be transferred or purchased separately.

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Key Features:
✅ High-torque 8-speed architecture rated up to 700 Nm for V8 and diesel performance
✅ Wide 7.07:1 gear ratio spread optimizes low-end towing power and highway fuel economy
✅ Integrated Mechatronics module delivers millisecond-level shift execution
✅ Compatible with ZF LifeguardFluid 8 for thermal stability under heavy loads
✅ Reinforced die-cast aluminum housing for full-size SUV durability

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Technical Notes:

Installation Criticals:
• Fluid Fill: Must follow the specific ZF/Mopar temperature-controlled level check procedure (30°C - 50°C) with the engine running. Over/under-filling causes failure.
• TCM Programming: The internal Mechatronics TCM requires VIN programming, software calibration, and Quicklearn clutch adaptation using wiTECH diagnostic tools.
• Torque Converter: Ensure full seating ("three clicks") before mating to the engine block to prevent oil pump damage.
• Cooler Flushing: Flush the transmission oil cooler, thermal bypass valve, and lines thoroughly to remove debris from the old unit.

Maintenance Tips:
• Use only ZF LifeguardFluid 8 or Mopar 8&9 Speed ATF (never use ATF+4).
• Perform Quicklearn adaptation reset via OBD2 scanner after installation.
• Monitor transmission temperature during heavy towing to prevent overheating.