I got a 1999 ls four door...four button...I was going to change the transfer case oil...auto zone said use 80-90...but I seen on here that I needed to use atf III.....then I seen where the three button took one and the four button took the other......what should I use..and how much???....also what i read on here about some one doing away with the vacum operated 4 wheel drive....how is that done...and where can I get a kit and how much....

 

I had my '99 Autotrac (4-button) equipped Blazer transfer case fluid change done and it takes Autotrak II fluid from the dealer, 2 quarts if I remember correctly. Its not expensive and it says right on the bottle that its for Autotrac vehicles. The fluid should be blue in color.

Here's a similar topic:
https://blazerforum.com/forum/steeri...ication-52425/

 

thanks man...I love this sight...if it wasn't for this site I would have changed it and put in gear oil like auto zone said too...,lol well before I change my front and rear diff...fluid it is just straight 80-90 with....posi additive right....and fill to fill hole??