New to me 02 Tacoma

I'm new to the forum. I just inherited my Dad's 02 Tacoma. I don't know much about these trucks. I have been looking around on this fours for some help. Its a extended cab 4x4 TRD.
In the next week or so I'm going to do some maintenance on it. change the oil, tranny fluid, antifreeze, an the gear oil.
I have found all the answers to my questions on this site. Well all but one. When doing the rear end gear oil do I need to add any additive with the gear oil. It has the electric locker in the rear. My other trucks have had limited
slip rear ends an I have had to add the additive stuff to them.

 

I don't believe you need to add anything other than gear oil for those. I could be wrong though.