What can a plugged axle vent potentially cause in a rear axle assembly?

A plugged axle vent can potentially cause increased oil leakage in a rear axle assembly due to the buildup of pressure within the axle housing. The vent allows for proper pressure equalization and escape of gases that can form from heat and normal operation. When this vent is blocked, pressure can build up inside the axle, which can force differential oil out at the seals and cause leaks.

Proper venting is crucial for maintaining the integrity of the seals, and if the pressures exceed what the seals can handle, it can lead to oil escaping from the axle assembly. This not only contributes to fluid loss but can also lead to inadequate lubrication of internal components, which may result in further damage over time. Therefore, the correct answer highlights the direct consequence of a plugged axle vent, emphasizing the relationship between venting, pressure management, and oil leakage.