Unless you are running high gearing/racing or towing, nix the deep pan.
You already have a tranny cooler?
Money better spent upgrading to an aftermarket cooler (fan depending on climate)
If you use the radiator as a trans. cooling loop, make sure your radiator is in real good condition as the cooling issues with Pontiacs is a PITA.
350 HO-400 Th400 4 core 326/HO 3 core
Essentailly, deeper pans are fine, but only necessary for racing or towing. If you are worried about frying a trans, a trans cooler with fan I would recommend to anyone regardless of climate.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.