Diagnostic Information on Rear Axle Vent Hose to Avoid Moisture/Water Intrusion

When diagnosing a rear axle leak or noise concern on the above-listed vehicles, a technician may find that the rear axle fluid is contaminated with water.

First inspect the rear axle vent hose routing location. The vent hose may be positioned directly below the gap between the cab and the pickup bed. In this location, the vent hose may be more susceptible to water/moisture intrusion from the elements or from automatic car washes. It may be necessary to relocate the vent hose to a new location under the pickup bed that will prevent moisture/water from entering the hose.