In 2003 BMW updated the transfer case for the X5 going from a chain driven non-electric transfer case to a chain driven electric transfer case known as the ATC500.
Although introduced in 2003 some still came with the non-electric transfer case. The best way to know for sure is to go to the rear of the case and look for a round tag or engravings. The easiest way is to look for an electric motor with a connection that goes to the vehicles computer.
Unlike its predecessor, the ATC500 has a clutch pack, electric shift motor (actuator) and the wires that go from the transfer case to the vehicles computer.
Most issues for this transfer case, like many that are chain driven, is the chain stretches over time and will need to be replaced.
We carry a large selection of parts for this unit including the bearings, seals, chain, clutch pack assembly (sprocket assembly), pump, drum and other parts. If you would rather just put a reman unit we can help with that as well. Either way we’ve got you covered.
Posted by CobraTransmission.com at Monday, August 01, 2016