TRE4x4 Differential Breather Kit

When drivetrain assemblies such as your vehicle’s differentials, gearbox, and transfer case heat up under normal operation, the air inside expands and increases pressure. To vent this additional pressure, most factory differentials have a one-way valve mounted to either the assembly itself or on a short extension tube close by.

Unfortunately, when the drivetrain assembly cools down, the air inside contracts, creating a vacuum. When cooling occurs during a water crossing, these one-way valves can draw water into the system, potentially causing expensive damage. The TRE4x4 Differential Breather Kit is designed to provide a high-flow, zero back pressure, and zero vacuum breather system to keep your drivetrain free of water.

This is achieved with a central high-flow air filter and manifold that will allow up to four drivetrain assemblies to be vented to one central location, positioned high enough to avoid water during crossings.

Out of the box, the 4 port TRE4x4 Diff Breather Kit can be connected to all four key components (front diff, rear diff, transfer case, and gearbox) and comes with enough tubing and fixtures to connect to the most common application of two differentials. With a small amount of additional tubing and fixtures (sold separately), the one kit will also accommodate your transfer case and gearbox.