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Good info. Did you do any research on the transfer case? I'm guessing higher viscosity would be beneficial there as well.

I think Dex3 was the latest greatest when many (most?) of these trucks were made, Dex6 didn't come out until 2006. I'll do some digging, a good test if I can find something in a TM that should be pretty simple.

Thanks, I'll try to find some of that and probably just use it in everything unless there is an advantage to using the dex6 stuff in the transmission. Do you know if Dex3 is the recommended fluid for the transfer case also?

So, Dex6 for transmission and 3 for the power steering? Dex3 for transfer case also or does it matter? Are you able to find actual Dextron 3 ATF or using the delco stuff referenced above that has been rebranded as manual transmission fluid? It seems that most of the ATF fluid I see...