Thanks a lot. I always thought that how can another fluid type be suitable not declared in the manual officially. So, I am thinking in the right way about the transmission. Probably I will prefer Mobil ATF 220. After an extensive research, I released that ATF Dexron II equals to ATF II generally, Mobil uses the title "220" instead of Dexron II.

Regarding the differential, I renewed the oil last year. I didn't know the previous fluid type, but stuck to the manual and changed it with Castrol Hypoid SAE90. Now, I will change the fluid anyway since a very low noise is coming from the back, although I don't exactly know the actual source of the noise. It is highly possible that the noise is not coming from the differential since this humming like noise is not constant, it is coming and going rarely. Nevertheless, I want to eliminate the possibility of differential. The winter time does not go under 5 degree. So, does SAE140 sound better in any case?