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Originally Posted by HandOverFist
Maybe I'm just hard headed, but most of that just doesnt make sense to me. Regardless of how much fluid you carry it will eventually get hot...a few extra quarts would just extend that time a bit. As far as keeping the level away from rotating parts...what parts? Half of the fluid is held in circuits anyway. I would love someone to explain exactly why there is a benefit to running a deeper transmission pan.
Thus far the only logical reason for a deeper pan I have heard to date is to keep the filter submerged during hard accelleration...not sure how big a problem that is with factory depth pans.
Another oddity...here is a TCI pan that doesnt even allow a longer filter/spacers -
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I think ss3011 gave a clear reason for a deep pan. If you can imagine the input shaft and the output shaft of your transmission they both rotate on the centerline or axis. All parts attached to either of those rotate with little clearance to the housing at near engine speed. If the fluid expands into their area it causes a pumping action which hurts efficiency and aerates the fluid. Aerated fluid does not cool well and the air bubbles are compressible causing pump inefficiency. Deep pans that are aluminum castings can also add some rigidness to the housing.