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Originally Posted by EricSilver
Based on the excellent post below, transmissions are under fluid pressure.
If I have a significant leak, say in the pan gasket, should I assume pressure is reduced and my shifting performance will be not be optimal?
I ask because I had a transmission service yesterday, which involved a new filter (the old one was filthy, but no debris or metal) and pan gasket to replace the faulty one, and I am noticing a difference. I had a pretty bad leak -- literally hemorrhaging tranny fluid when the car was parked, which I assume was a pan gasket leak.
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I don't think the fluid in the pan is pressurized, any more than the oil in your engine sump is pressurized. The oil in the transmission, and the engine, are pressurized for internal use, and drain back to the pan to be recirculated and repressurized.
A leak will lower the fluid level, and transmissions are a
lot more sensitive to fluid level, to the point where drivability is affected. The engine oil level only affects the cooling capacity of the oil, until it is so low that air is entrained and it foams.
Best Regards,
Jim