Transfer case fluid

Taswe · June 18, 2003

I have a 99 Tahoe with the autotrac 4WD. How often are you supposed to change the fluid in the transfer case and what fluid do you use?

bigtruck21 · June 18, 2003

I've heard anywhere from 15-30k and use the gm autotrac 2 fluid "blue"

WEFs99 · June 18, 2003

Unless you run it extremely hard, I wouldn't change it any sooner than the factory recommends. Definitely use the new blue stuff. I believe it is synthetic and it made a world of difference in my '99.

MarkD · June 18, 2003

It depends on your mileage. I would change it after the first 15k, then at 50k, then at 100k. Not a regular interval, but I think there is much to gain from doing the first change early.

GM Blue vote as well.

Taswe · June 19, 2003

Thank you all for your input

99silveradoz71 · June 20, 2003

Did the first change on my 99 at 36k or so last fall. I went with the new blue fluid, which is supposed to assist in quieting the driveline clunk.

QIKSILVR · June 20, 2003

Is the new Blue Fluid called Auto-Trac II? Part number?

Jersey Tahoe LT · June 20, 2003

Not sure of the part # but yes the name is Autotrack II. The Dealer will know what you need. Tell them the blue stuff. I changed mine right after I bought it. It turned out it was never changed in 65k miles. Yowsa that is scarry. I will brobably change it ever year since I have over sized tires and I can't afford to change Gears. Will change the whole Drive line fluids yearly.

Later,

Brandon