M978 Transmission Breather Vent Leak

[matt2491]

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]

Maybe fluid too hot and maybe fluid has air entrainment. Too hot can be diagnosed with thermal gun, entrainment will be white foamy fluid.

 

[matt2491]