I have decided to change differential oil and I was wondering which part (rear diff or transfer case) shares the same oil as the transmission? I only know that that’s the case of 6MT, but not for 8AT (ZF8HP).

I bought the LiquiMoly 75w-90 gl4/5 (1qt) for the rear diff, but which oil do the front diff and case use? Is it the same one?

Thanks for future help.