Transfer case chain (ATC500)

The most common symptoms of a stretched chain include a loud clicking or popping noise during hard acceleration, jerking or shuddering under load, and in severe cases, a loss of power to the front wheels. If you feel a ‘skipping’ sensation, the chain is likely jumping teeth on the internal gears.

This specific chain is designed for the ATC500 transfer case, which is typically found in the BMW X5 E53 facelift models (produced roughly between 2003 and 2006). Always verify your transfer case model via the metal tag on the housing before ordering.

While jerking can sometimes be related to tires or transmission, a worn ATC500 chain is a primary suspect. When the chain stretches, it can no longer maintain tension, causing it to slip. This disrupts the uniform power transmission between the front and rear axles.

Yes, absolutely. To ensure the longevity of your new chain and the internal clutch packs, you should refill the transfer case with fresh, high-quality BMW-approved fluid (such as DTF 1 or TF 0870) after the repair.

Replacing the chain requires removing the transfer case from the vehicle and opening the housing. It is a task for experienced DIYers or professional mechanics. Special care must be taken not to damage the internal oil pump or clutch assembly during the process.