Vehicle is a 1998 Chevy Blazer S10 with 4.3L V6 gas engine.
Transfer case is NV233, and takes either GM Auto Track II or Dexron VI. Front and rear differentials take 80w-90 gear oil.
I would like to drain a little of the existing t-case fluid and add some Trans Tune a week or so before changing the fluid; and am also considering adding some Trans Tune with the new fluid.
I’m also looking for a good way to flush out the front differential (without taking it apart), since the old gear oil in it is very dirty.
Is Trans Tune compatible with the Auto Track II fluid that’s currently in the transfer case? Would it be a good or bad idea to add some to the new fluid (and how much)?
Would Trans Tune work in the front differential? Would Sea Foam Motor Treatment be better? Should I drive it with the additive in it, or just fill and drain?