Sprocket Output (ATC450)

The sprocket output is a critical internal component of the ATC450 transfer case. it serves as the connection point to the driveshaft, allowing the system to distribute power evenly between the front and rear axles. This ensures your BMW maintains proper traction and the signature xDrive handling.

If this part is failing, you might notice vibrations coming from the drivetrain, unusual clunking noises during acceleration, or a jerking sensation when the vehicle tries to shift power between axles. In severe cases, it can lead to a complete loss of 4WD functionality.

This specific sprocket output is designed for the ATC450 transfer case. This unit is most commonly found in BMW X5 (E70 LCI) and X6 (E71) models produced between 2010 and 2013. We recommend checking the tag on your transfer case to confirm it is an ATC450 model before ordering.

Uniform power transfer prevents unnecessary stress on the differential and transmission. When power is transferred smoothly, it reduces tire wear and prevents the “binding” sensation often felt in tight turns when a transfer case component is malfunctioning.

Replacing internal transfer case parts like the sprocket output is a complex task. It requires removing the transfer case from the vehicle and disassembling it. Unless you have professional-grade tools and experience with drivetrain repair, we strongly recommend having a certified mechanic perform the installation.