BMW ATC400 xDrive Transfer Case Clutch Plate Kit

This is the multi-plate clutch pack that sits inside the BMW ATC300 and ATC400 transfer cases. The actuator motor squeezes this pack to send torque to the front axle, so when the plates glaze or wear thin the system can no longer hold a steady front/rear split. The set replaces the plates sold under BMW 27103455136 and 2710345139 and comes as a full stack of friction plates and steel plates.

Listed fitment: BMW 3 Series E90/E91/E92 (2004-2013), 5 Series E60/E61 (2003-2010) and X3 E83 (2003-2010) with the ATC300 or ATC400 case. Read the tag on the transfer case before ordering; X5 and later models use other cases.

Typical symptoms of a worn pack are a shudder or binding feel in tight parking-lot turns, a clunk on takeoff, front drive that engages late, and xDrive or 4x4 warning lights once the actuator runs out of travel trying to clamp it. If you replaced the actuator motor and the problem stayed, the clutch pack is the next suspect.

Bench notes: drain the case, split the housing, pull the old stack and keep the original order of steels and frictions. Soak the new frictions in the correct transfer case fluid before assembly, stack them in the same order, check the pack clearance against the old stack, then reseal the case and refill with fresh fluid. Clear codes and let the actuator relearn its position.