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Jerry, Since you are the only serious response, I will try to answer some of your comments. Sounds like a PVC system for the tranny case.I don't understnd how a vent will fix a problem that's due to condensation(the water being heavier than oil sinks to the bottom of the oil pool or is held in suspension in the oil by additives) unless you plan on running the engine all the time. Besides, at idle, when the intake vaccum is about 28 - 29in Hg, you'll be having a hard time keeping the seals from sucking in. The filtered inlet in the filler cap would have more flow capacity than a smalll ID vac line over a distance. Still, you raise a good point. The vacuum line would have to be small diameter, for engine considerations also. When the tranny is running is when the moisture turns to vapor. It takes a while for the Cast Iron cases to heat up. As is, I think the moisture condenses on the colder Iron. Most old tractors are vented through the dip stick and if you work them regularly, the oil gets warm and the water evaporates. It's the ones that sit for long periods of time unused that have the problem. That is how it works for the engine. The advantages in the engine are: more heat and changing crankcase volume due to piston movement. (though a 4 cyl is semi balanced in that regard) The changing crankcase volume is the reason for the filtered breather cap. Since the volume in the tranny, diffy, lifty is more static there isn't much breathing going on. As such no filtered vent was provided on these tractors.
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