differential / axle breather serves the important purpose on a 4WD
vehicle of venting the air pressure in drivetrain assemblies such as the
differentials, transmission and transfer case. Under normal operations,
these assemblies heat up and the air inside expands, increasing the
pressure and thus the need to be vented to the atmosphere is created.
When the drivetrain assembly cools down the air inside contracts and
creates a vacuum.
drivetrain assemblies are fitted with a breather from the factory. These
factory breathers are usually a one-way valve mounted directly to the
housing or remotely on a short tube. The shortfall with the factory
breathers is that driving through water crossings creates a vacuum
caused by the drivetrain assembly being cooled rapidly by the water.
This vacuum will tightly close the valve shut causing air to be
instantly drawn into the assembly through the seals. Many times the
seals are still submerged below water, leading to the water being drawn
into the drivetrain. This will contaminate the oil and possibly damage
drivetrain components or your Air Locker.
ARB Differential Breather Kit is designed to eliminate these
shortcomings by providing a high flow, zero back pressure, zero vacuum
breather system. This is achieved with a high flow air filter within a
central manifold that will allow up to four drivetrain assemblies to be
vented to one central location, ideally somewhere on the vehicle that
will be above the water level at all times. This kit is intended to
replace your factory breathers and contains enough fittings and tubing
to connect at least two drivetrain assemblies. More tubing and push-in
fittings can be purchased separately to connect up to four assemblies to
the central manifold (Part Number 170113).
ARB Differential Breather Kit is unique in that it uses 8mm tubing
(where most other kits use 6mm tubing). The larger size tubing is
essential in 4X4 applications where off camber driving can cause oil to
enter and block smaller breather lines