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What type fluid does the Manual Transfer Case in my 2500HD '07 Classic Duramax take ? (GM Part No. 88861800) Is it the same as the Allison Transmission fluid (Dexron VI) ? My manual says to use SAE 80W-90 in the front axle but says to use 75W-90 Synthetic in the rear. Whats going on ?
 

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In checking GM part Nos. Dexron VI is #88861003 and the GM part No for fluid for Pick-up Models with manual transfer case is #88861800. I'm taking for granted that my transfer case is manual due to the floor shifter.
 
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