I plan on looking at my T-case fluid and the oil in my differentials. I was wondering what am I looking for to tell me I should change it? Also any tips in changing these fluids if I need to.

 

Your transfer case should be good, but just pull the fill plug (top) on the back of the case and make sure that the level is right at the bottom of this plug. You MUST use GM Autotrak 2 transfer case fluid due to the design of the AWD transfer case.

You may not have a drain plug though. If you do not have a drain plug, you will need a small hand pump to pull the old gear oil out. For the front diff, you need to use 80w90 or 75w90 synthetic gear lube.

If you wanted to, it wouldn't hurt anything to change out the transfer case or diff fluid.

 

My manual says DexronIII ATF for the transfer case. Is the Autotrak 2 better for it or is the manual an error? If I should use Autotrak 2 do I need to head to a dealer or is it sold at advanced or napa?

 

You are correct. Sorry, I was in remembering when the change in the transfercase happened. The '98+ Auto4wd and AWD transfer cases require the Autotrak 2. Yours is good with Dexron III ATF as it isn't a viscous coupling type transfer case. Thought that change happened in the '97 model year, but looking back now it happened in '98... Sorry about that.

 

Ok my dealer says I should use AutoTrak 2 but I have to do a flush and fill then drive 10 miles and do another flush and fill.