Transfer case oil pump KIT (ATC300)

Common symptoms of a failing oil pump in the ATC300 unit include jerking or shuddering during acceleration, unusual grinding noises from the drivetrain, or the appearance of the 4×4/DSC warning light. If the pump stops circulating oil, the internal clutches and bearings can overheat and fail rapidly.

This kit is specifically designed for the ATC300 transfer case. This unit is typically found in BMW E90, E91, E92 (3 Series) and E60, E61 (5 Series) xDrive models. We recommend checking your transfer case ID tag to confirm it is an ATC300 before ordering.

The oil pump is the heart of the transfer case’s lubrication system. It ensures that the lubricating substance is delivered to the clutch packs and gears. Without proper oil circulation, the internal components experience high friction, leading to premature wear and expensive mechanical breakdowns.

While the kit provides the necessary parts for oil delivery restoration, replacing it requires opening the transfer case housing. This is generally considered a task for experienced DIYers or professional mechanics, as it involves precise assembly and the use of specific transfer case fluid.

If your 4×4 light is caused by internal overheating or lack of lubrication due to pump failure, this kit is a vital part of the repair. However, we suggest scanning for error codes first to ensure the issue isn’t related to the actuator motor or a simple fluid change requirement.