Transfer case chain (ATC700)

Common symptoms of a worn ATC700 chain include a loud clicking or snapping sound under heavy acceleration, or a ‘jerking’ sensation when the 4×4 system engages. If the chain is severely stretched, it can slip over the gear teeth, causing a loss of power to the front wheels.

This specific chain is designed for the ATC700 transfer case, which is most commonly found in the BMW X5 E70 (2007–2010) and the BMW X6 E71 (2008–2010). Always check your transfer case identification plate to ensure it says ATC700 before purchasing.

In many cases, the ‘shuddering’ or jerking during acceleration is caused by the transfer case chain skipping teeth because it has stretched over time. Replacing the chain usually fixes this issue without needing to replace the entire expensive transfer case assembly.

Yes, you can replace just the chain. It is a very cost-effective way to rebuild your ATC700 unit. As long as the internal gears and the clutch pack are in good condition, a new chain will restore the 4×4 functionality and eliminate slipping.

Chain wear is often caused by aggressive driving, mismatched tire sizes between the front and rear axles (which puts extra strain on the 4×4 system), or high mileage. Regular transfer case fluid changes can help prolong the life of the internal components.