Transfer case fluid?

[farhanm]

Planning to do the transfer case fluid change on my 2009 Yukon XL SLT. Been searching on the forums to find which fluid to use and am confused between Auto Trak II or Dexron VI?

I have a dial which mostly stays in Auto.

Here's a picture of the RPO codes. From what I found out is that I have NQH transfer case. Cannot figure out which fluid to use with it.




Any help will be appreciated

Thanks
--
Farhan


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[JML07denali]

I just replaced transfer case fluid on my 07 Yukon Denali AWD. I used Royal Purple MAX ATF.


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[farhanm]

I just replaced transfer case fluid on my 07 Yukon Denali AWD. I used Royal Purple MAX ATF.


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Joe, any particular reason use used royal purple?

 

[JML07denali]

I did quit a bit of research many said it is a good,high quality oil. I also replaced my front and rear diff with royal purple MAX Gear oil 75W-90.


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[farhanm]

Hmm. I was planning to use Mobil 1 synthetic 75W-90 for both front and rear diff.
Royal purple is supposed to be better?


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[JML07denali]

I think Mobil 1 is good as well. My personal preference was royal purple. It was certainly not cheap each quart was around $22


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[M3kanic]

Is it awd or 4wd?

Awd uses dexron VI

4wd uses auto trak II

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[farhanm]

It's 4WD I believe, I thought only the denali's with a 6.2L ver AWDs


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[M3kanic]

You can get a Tahoe with a 6.2 awd. But I believe that you can get Yukon Awd as well.

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[farhanm]

Another question I had for the rear diff, do I need to replace the gasket? I plan to take the whole cover off. The truck has about 114k miles on it. Not sure if the previous owner changed the fluids on the diffs


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