Transfer case sprocket (ATC13-1)

Jerking or shuddering during acceleration is often a sign of a worn transfer case sprocket or chain. If the teeth on the ATC13-1 sprocket are damaged, power transmission becomes inconsistent, leading to these mechanical vibrations. Replacing the sprocket with a hardened steel version can restore smooth operation.

This sprocket is manufactured from highly hardened material and precision-machined. In high-torque BMW xDrive systems, standard metal components can fail under pressure. Our sprocket is designed specifically to withstand harsh conditions and prevent premature wear of the transfer case assembly.

Yes, this component is specifically engineered for the ATC13-1 transfer case model commonly found in various BMW xDrive vehicles. To ensure 100% compatibility, please verify that your transfer case ID tag mentions ATC13-1 before purchasing.

Not necessarily. If the internal damage is limited to the sprocket and chain, you can perform a rebuild using high-quality replacement parts. This is significantly more cost-effective than replacing the entire BMW transfer case assembly, provided the housing and clutch packs are still in good condition.

Common signs include clicking noises from under the vehicle, a “4×4” or “DSC” warning light on the dashboard, and a loss of front-wheel traction. Upon inspection, you will see rounded or broken teeth on the sprocket itself.