My opinion on this subject....diffs can be damaged equally by being too hot or too cold.....we used to sit a car on stands and rotate the wheels to warm the diffs up......we now also use laminova's to keep the all the car oils incl P.S. oil at an optimum temperature....recently on the Malcolm Wilson rally we were gaffer taping up a car with air cooled diff and P.S. coolers to get some heat into the diffs and P.S......viscous diffs are notorious for overheating with abuse....and yes i'd agreed a plated diff would generate more heat than an ATB....but I think Tony has hit the nail on the head with this problem....the weight distribution needs some attention....probably sprung too hard....

Ian