GM: No Dexron VI ATF in Transfer Case

[tomp]

Dex3 was always specified for the Transfer Case even in my 2006 H2 which calls for Dex6 in the tranny. Dex3 is too thin (viscosity) for the TC which gets really hot.

Mobil1 and Royal Purple and AMSoil doesn't make Dex6 ATF. AMS claims their multi-purpose ATF will work fine and meets the spec but read their specs closely and you will see it doesnt meet Dex6!!!! I dont trust them lying marketing pyramidding bastards at AMS.

The Mobil1 & RP ATF will be fine for your TC. However, the new spec for all GM trannys is Dex6, so if you want full synthetic, you need to look at Redline as they are the only one that meets the Dex6 spec.

Redline also makes a High Temp ATF (Dex3) for your transfer case. In case you hadn't found out the hard way, the TC gets really hot and burns up most ATFs much quicker than the manual says to change it!!!!

Also note that Redline uses first class stock and is the only company in the world that does! Sure, AMS wins the ball bearing test using new oils but it's because of all their additives. Do your research and you will find that the additives wear off quickly. Redline's higher class stock recieves less additives and requires less than any other oil - period! In the long run (high mileage) the Redline fluid wins.

BTW, I hate oil threads just thought some people need to hear the simple truth. On that same note, I am off this oil topic

[Klaus]

Mobil 1 and RP ATF might be "fine" in your TC, but you will NOT be using an approved fluid and could be a cause for warranty denial. No aftermarket fluid is GM approved and certified as Dexron III.

The only current GM approved fluid for manual transmissions and transfer cases that require Dexron III ATF is GM Manual Transmission fluid part number 88861800 U.S. (88861801 Canada). Period.

[Humdingah]

What's a warranty???

[working Hummer]

so, I've got mobile 1 syn. in my TC, are you saying go back to Dex III? Seem's silly.

[Klaus]

That's for you to decide. Since 2006 there has been no "official" Dexron III ATF produced.

This is the kind of crap that can happen when ATF is used in other applications. When the fluid is reformulated for better performance in automatic transmissions, a problem develops in manual transmissions and transfer cases!

[MONSTERMATT]

OK, so u sayin i should drain amsoil out the t-case and the royal purple out the pan?? i noticed with the royal purple that my tranny ran a little cooler as soon as i went with it, when i put in the purp i brought it all to the dealer and they did it for me and never said a word, thats funny!

[Luv2Camp]

SO now I am really confused. Went to my local Hummer dealer today to purchase the manual gear oil listed in the tsb for my 06 H2 and was told by both the parts and service areas that they are using DEX6 in the transfer case as the DEX3 is no longer made. When I told them that GM was advising to use the manual gear oil the parts manager went in the back and came back a few min later and told me he called GM and they said that they confirmed I should use the DEX6 in the transfer case.

Not sure what I should do now!