On top of the C4 is supposed to be a vent cap, right?
I had one once that did not have a vent. My current tranny does. I also have an o-ringed, locking dipstick. When working on the car this weekend, I drained the tranny fluid twice. I have a deep aluminum pan with a drain plug. When I pull the drain plug, I can clearly hear the tranny sucking air in through the vent hole. I was surprised to hear the noise so clearly. I'm wondering if there is any problems that might arise from not having the tranny vented enough.
385 ci Cleveland. 10.95 @ 127 mph. Street tires and mufflers.