Transfer case Oil

[shawndondo]

Have a question, it is time for me to do my 50,000-mile maintenance for my 2008 Hummer H3, and I’m running in to a problem. I have the HELM 2008 Service Manuals and it says to use Dex-VI but my Owner’s manual says to use manual trans/Transfer case fluid GM Part 88861800. The reason I am asking is that I have read that Dex-VI should not be used in transfer cases that call for Dex-3 or what is now known as GM Part 88861800, because GM withdrew the license and spec for Dexron III. I called the dealership and they said they use Dex-VI but that contradicts what my owner’s manual and http://www.cadillacfaq.com/faq/tsb/data/pip3836.pdf

I know that PIP3836 says 2007 but my owner’s manual still says to use GM Part 88861800. I have a feeling to go with my HELM Service Manual that says Dex-VI but I am unsure. Any suggestion??

 

[f5moab]

From the GM electronic service manual:
Transfer Case Fluid
DEXRON®VI
88861003
88861004
Vehicle Speed Sensor O-Ring
DEXRON®VI

Back when Dexron VI was first released, there was some confusion from B/W in regard to the fluid they wanted in the t/case. They originally came with Dexron IV. B/W did testing and finally approved Dexron VI. In addition, owner manuals are notorious for being incorrect, at times.

I had mine changed when they did the trans flush and they used Dexron VI. Got a great price so I told the dealer to go ahead and do the t/case too.

 

[shawndondo]

Thanks F5. Time to get it on the lift and start turning the wrenches