Allison and Eaton Fuller Transmission Breather Check
If the transmission is equipped with a housing breather (see Fig.), it must remain clear. A plugged breather could result in pressure build-up, which could cause oil leakage.
Important: Do not spray water, steam, or cleaning solution directly at the breather. These actions can force water or cleaning solution into the transmission and contaminate the transmission fluid.
If the breather is plugged, clean or replace it. If replacing it, use a correct-size wrench (pliers or a pipe wrench can crush or damage the breather stem and produce metal particles that could enter the transmission).
Check more often if the vehicle is operating under very dusty conditions.
Note: Location of the transmission breather will vary depending on transmission model.
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Breather
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Shift Tower