BMW 740i (GA8HP50Z) Automatic Transmission | Genuine ZF 8-Speed Gearbox

Description

If your BMW 740i is experiencing severe transmission slip, harsh engagement, “Drivetrain Malfunction” warnings, or complete mechanical failure, replacing the transmission unit is the definitive solution. We supply workshop-vetted, original ZF 8-speed automatic gearboxes—specifically the GA8HP50Z variant utilized in the 740i chassis.

These genuine transmissions ensure that your luxury sedan maintains its legendary butter-smooth power delivery, responsive kick-downs, and optimal fuel economy, avoiding the calibration and shifting issues common with improperly rebuilt units.

• Factory-Spec Performance: Restores the lightning-fast, seamless gear changes characteristic of the ZF 8HP platform.

• Mechanical Integrity: Inspected for internal clutch pack wear, clean fluid condition, torque converter health, and pristine casing threads.

• Condition: Premium workshop-vetted original component; sourced from verified low-mileage vehicles and tested for flawless hydraulic and electronic operation.

Key Considerations for Transmission Replacement:

• Mechatronic Unit & Programming: The 8HP50Z utilizes an integrated Mechatronic control unit (computer and valve body) that is “married” to the vehicle’s EGS/CAS security system. Your Mechatronic unit or its ISN (Individual Serial Number) will need to be coded or transferred to match your car’s VIN so the vehicle will start and shift correctly.

• Fluid & Cooler Flushing: Whenever a transmission is replaced, the transmission oil cooler and lines must be professionally flushed to remove any metal contaminants from the old, failed unit. Failure to flush the lines will quickly contaminate your replacement gearbox.

• Torque Converter Check: Ensure the torque converter is fully seated into the oil pump before bolting the transmission to the engine block; improper seating is the #1 cause of immediate oil pump failure upon startup.