Diff Cooler - isnt it simpler to just comit to chaning the diff oil with an 80W140 synthetic product every 10k miles? Or is there an actual temperature problem here which takes the gears/mechanism to an unacceptable life threatening temperature?

Tranny Cooler - this raised an interesting point - I was wondering if anyone doing a) 1/4mile b) track racing, has noted how hot their tranny gets?
What's the OEM spec MAX temp anyway?
I'm guessing if its an issue - then even more so if you wack on a pulley++ and up the 350bhp to 400-450bhp!
Improved cooling on an expensive item like this is where I'd be focusing my moula....