Ring (ATC35L, ATC45L, Hyundai ATC)

This ring is a high-quality stainless steel component designed to secure internal parts, specifically spacers and needle roller bearings, within the transfer case. It ensures that these components remain in their correct position to prevent mechanical play and wear.

Yes, this ring is specifically engineered for the BMW ATC35L and ATC45L transfer case systems, as well as Hyundai ATC units. It is a precision-fit component designed to match the original equipment specifications.

Stainless steel is used for this component because it offers superior durability and corrosion resistance. Given the high-friction and high-heat environment inside a transfer case, stainless steel ensures the ring won’t degrade or lose its structural integrity over time.

If the internal securing components like this ring fail, you might experience unusual grinding noises, vibrations during acceleration, or a ‘jerking’ sensation. This usually happens because the needle bearings or spacers are no longer properly seated, leading to internal misalignment.

Replacing this ring requires disassembling the transfer case. If you have experience with drivetrain repairs and the necessary tools for opening the ATC unit, it is a straightforward replacement. However, due to the complexity of BMW and Hyundai transfer cases, professional installation is often recommended.