There is no diaqueen avaliable here in my country.
Can I use Toyota GL-4 gear oil, which is recommended for 4wd transmissions of Toyota?
Currently, I am using Zic and facing gear shifting issues during power shifts.
Any recommendations?

 

i believe that for your tranny you can use Redline shockproof....if not, redline 75-90 should work fine.

For your AYC/ACD....different story

 

and what is recommended for ACD/transfer case oil?