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ATF in manual shift transfer case (floor shifter to engage 4x4) and AutoTrac II in all pushbutton (electronic) TC's. There is no alternative to AutoTrac II, you must use the GM fluid as no other product is made for this.

btw - Amsoil still offers a ATF for use in Dexron III applications. So does GM but they call it a different name.

This information applies to 2007 and prior GM passenger cars and trucks.

Dexron III is being phased out as a product name. It is being renamed Manual Transmission Fluid and carries p/n 88861800 U.S. (88861801 Canada).

If fluid p/n 88861800 U.S. (88861801 Canada) is not yet available when servicing a manual transmission or transfer case, Dexron III can be used in its place.

DO NOT use Dexron VI in place of manual transmission fluid in any manual transmissions or transfer cases that specify Dexron III, as a failure may result.
 

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You have to keep in mind its not always the performance issue of a fluid but the chemical makeup of it that qualifies it for use in transmission, transfer case etc.

I am not specially talking about AT II but in general terms. Some fluids are recommended over others because of the additives used could or do have a chemical reaction with the internal components of the assembly in that they have a corrosive effect on some metals (Copper Corrosion) used in that assembly. Example: Using a GL5 rated gear lube in a manual trans that specifics only GL4. Another reason Dexron VI is not recommended, it has not been validated (tested) in these applications to determine if its going to eat away some metals in use.
 
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