A diff pump and cooler is definatly a gooe idea, especially on a track day car with a std diff

WTF are you on about mike ?

there are two problems with heat in a std diff, one is the oil that lubes the gears , if the viscosity is lost then its good bye gears, thus in turn heats up the viscous coupling, if they reach approx 140 deg iirc and it doesnt take very long to do this in summer on a track, then the viscous unit will 'lock' , causing som eof the worst understeer you have ever seen on car, pretty much like driving a car with a welded diff. makes the car handle like shit.

after this unit has locked , you hit a corner, you then make the two tiny undersized planet gears try to work against each other, at a massive force, thus blowing them to pieces.

so who doesnt want to fit a cooler then ?????

yes the 200sx works fine , i have one on my diff, and i also have one for the front diff and the gearbox. also have temp probes fitted to let me know the temps, the best way to do it is make the temp probe switch the pump relays on, thus never over temp, never under temp

dont need a cooler