^ Tranny coolers are GREAT, unless you live in a really cold climate.
Why? The ATF (Automatic Fluid Transmission) needs to be in a certain temperature range or else it might damage the tranny, too. It's like engine oil, if it's TOO cold it's not doing any good.
In LA, I guess a tranny cooler is fine
Positive qualities about tranny coolers:
-Extended life
-Smoother shifting
-Less frequent tranny flushes
-Can save you money! A $75 tranny cooler can extend your life by 10,000+ miles. Cheaper than replacing a tranny ($2k+)