Drivetrain

DRIVETRAIN






The transfer case, driveshafts final drives and half shafts complete the drivetrain assembly The transfer case is always mounted in the same position on the X5. This applies to other markets and future models that will utilize different transmissions for different engine configurations With these models, the transmission tail shafts will be modified to match up with the transfer case.

The rear driveshaft is a two piece unit using a center bearing, while the front drive shaft is a single piece that is splined to the transfer case and bolted to the front differential.

The breather vents for both differentials and the transfer case are mounted higher up on the chassis to prevent water from entering if the vehicle is driven off road through water. The front breather passes up into the engine compartment and is mounted under the left side ignition coil cover. The rear breather passes along the under side of the body and is mounted behind the left side wheel arch cover.

DRIVETRAIN - TRANSFER CASE
The transfer case is manufactured by New Process Gear Division of New Venture Gear Company. It is identified as model NV 125.

It incorporates a planetary gear set and chain to provide the torque split and all wheel drive. The output torque of the transmission is applied to the planetary carrier of the gear set. The rear drive shaft is connected to the annulus gear and the front drive shaft is connected to the sun gear through the chain drive.







As the output shaft of the transmission turns, the planetary carrier rotates, causing the planetary gears to drive the sun gear and annulus gear.







A torque split of 68% rear/32% front is provided through the gearing of the planetary set.

DRIVETRAIN - FINAL DRIVES
The final drives for the front and rear axles are conventional differentials. The DSC system provides anti-spin/slip control for both the front and rear axles on the X5.







The rear differential is the HAG 188K (compact) unit with a ratio of 3.64 : 1







The front differential is the VAG 174 unit with a ratio of 3.64 : 1.