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M978 Transmission Breather Vent Leak

matt2491

Member
31
32
18
Location
Billerica, MA
Any idea why my M978 HEMTT is leaking transmission fluid from the breather vent on top of the trans while running?

I'll be driving the truck, come to a stop, and it will be dripping down the side of the trans, onto the axle, and onto the ground. It's enough that it's a problem (I don't want to park the truck anywhere nice).

Transmission is not overfilled.
 

NDT

Well-known member
Steel Soldiers Supporter
10,107
5,714
113
Location
Camp Wood/LC, TX
Maybe fluid too hot and maybe fluid has air entrainment. Too hot can be diagnosed with thermal gun, entrainment will be white foamy fluid.
 
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