Technical Training
545i, 530i, 525i (E60) DrivelineAutomatic Transmissions (GA6HP19Z / GA6HP26Z)
The GA 6 HP 26Z applies to the 545i.
The GA 6 HP 19Z applies to the 530i and 525i.
BMW has developed an automatic six speed gearbox together with ZF (Zahnradfabrik Friedrichshafen), designated the GA6HP19Z / GA6HP26Z for the E60. It represents a further development of transmission technology in BMW automatic gearboxes. These gearboxes make an important contribution to the features of the E60.
The mechanical power transmission of the gearbox has been optimized with regard to gearshift comfort, quality and reduced fuel consumption. The engine torque is transferred to the gearbox by a torque converter with a controlled lockup clutch. The six forward gears and the reverse gear are produced by a Lepelletier planetary gear train. The gears are shifted by multi-disc clutches. The (GA6HP19Z) and (GA6HP26Z) transmissions are based on the same design, they feature different torque converters and clutches. On the E60, the drive stages and the parking lock are controlled directly by the selector lever in the center console. This section addresses the changes necessary for the E60.
The E60 automatic gearboxes advantages.
- Designed as a 6-speed gearbox with an overdrive ratio in 5th and 6th gear, reducing fuel-consumption.
- The 6-speed gearbox allows for more gear spread, improving vehicle acceleration.
- The number of interfaces has been reduced by using the Mechatronics Module for the electronic transmission.
- Lifetime oil-fill.
Manual Transmissions GS6-37BZ / GS6-53BZ
Manual Gearboxes
The following 6-speed manual gearboxes apply to the E60:
GS6-37BZ for the 525i, 530i
GS6-53BZ for the 545i
Designations
Old Designation:
GM Hydro-Matic, ZF And JATCO Automatic Transmission:
Parking Lock Operation
On the E60, the parking lock is operated via the selector lever in the center console. A cable assembly provides the connection to the gearbox (as on the E46 and E39). The drive range switch and the hydraulic selector operate together by the selector lever in connection with the cable assembly.