welcome to bimmerwerkz..
for the whole heat at the gearbox issue, i notice this as well in my manual tranny, but nothing too substancial , just sometimes i notice it sometimes i dont, ive never actually inquired about as the performance has never been affected..
as for teh diff , the only real way to know is by having the car in the air, and running it while in the air to pin-point the exact spot, do you notice any leakage from teh seals?
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