Sliding Block (ATC13-1)

This sliding block is crucial for stabilizing the movement of the transfer case chain. It prevents excessive vibration and ensures the chain follows its intended path, which protects the internal gears and housing from premature wear.

Common signs include a clicking or grinding noise coming from the drivetrain, especially during acceleration. You might also experience a ‘jerking’ or shuddering sensation during low-speed maneuvers or when the xDrive system engages.

This part is specifically engineered for the ATC13-1 transfer case. This unit is typically found in various BMW F-series and G-series models. Please verify that your vehicle is equipped with the ATC13-1 unit before purchasing.

It is manufactured from a special high-performance, heat-resistant plastic designed to minimize friction. A metal block would cause significant wear on the chain itself; the plastic material acts as a sacrificial wear-surface that preserves the more expensive chain.

Installation requires disassembling the transfer case. Because it involves critical drivetrain tolerances and sealing, we recommend this be performed by a professional mechanic or a drivetrain specialist to ensure proper chain tension and leak-free reassembly.