2016-2019 BMW 7 Series 4.4L Rear Differential 2.81

Also known as

Rear Differential

Final Drive Assembly

Rear Axle Carrier

Diff Assembly

Pumpkin

What this part does

The Rear Differential mounts to the rear subframe and serves as the final link in transferring rotational power from the driveshaft to the rear wheels. It contains a set of gears that reduces the driveshaft speed and increases torque, while allowing the left and right wheels to rotate at different speeds when cornering. In all-wheel-drive configurations like the xDrive system, it operates in tandem with the transfer case and front differential to optimize traction. When the internal bearings or ring and pinion gears wear out, the unit typically develops a high-pitched whining noise that changes pitch with vehicle speed, or a deep growl during deceleration. Excessive backlash from worn components can also cause a distinct clunking sound when the vehicle shifts gears or when accelerating from a stop.

Fits these vehicles

Before you order

You must verify that your current vehicle utilizes a 2.81 gear ratio before purchasing. Installing a differential with an incorrect gear ratio in an all-wheel-drive vehicle will cause severe mechanical binding in the transfer case and immediately trigger drivetrain malfunction warnings on the dashboard. You can confirm your required ratio by checking the stamped metal tag attached to the cover bolts of your existing unit, or by referencing your VIN through a dealership parts department. Prior to installation, it is standard practice to drain the remaining fluid, replace both axle seals and the input shaft seal, and refill the casing to the factory capacity with fresh, manufacturer-approved synthetic gear oil. Inspect your flex disc (guibo) and center support bearing during installation, as worn driveshaft components often contribute to premature differential failure.