Hi, I'm wanting to change my transmission oil, do I need to change the transfer case oil and rear diff oil too? I just wana improve shifting that's all.
Also I found there is a little reservoir next to the brake fluid reservoir saying "NABCO" on the cap, what's that for?

 

You don't have to but it would be good to do the others, especially if you have no idea when it was done last.

That little reservoir is for your clutch master cylinder.

 

Thanks for the reply, the fluid inside the clutch master cylinder seems to be very dirty, it's a black blown colour, is that mean I have to change the clutch oil too?

 

I thought the brake fluid and clutch fluid is the same, isn't it? If it is so what the fluid in the clutch master cylinder for?

 

The brake fluid and the clutch fluid are the same. Its because your car has a separate reservoir for the brake and the clutch, where as most newer cars have just one.

 

Ok, but my clutch fluid is very dirty and brake fluid is still in gold yellow color.
One more question, does rear diff oil = AYC oil?