r/Hummer • u/cactire • 1d ago

Looking for viable options for transfer case fluid and transmission fluid

My grandpa needs help finding fluid to use for his transfer case and transmission. I'm posting here in search for him.
He owns a 2007 Hummer H3 with a manual transmission
In the manual he says his transfer case and transmission both need 75W-90 gl3 only which he is struggling to find online (I am too) and the only listing he can find is $81 per quart so any aid would be appreciated!

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u/Fit_Rise1258 1d ago

The 2007 manual will say to use manual transmission fluid, however, there was a subsequent publication that came out later specifying AUTO transmission fluid, to match the later year H3's. 08 and 09 specify Dextron VI, and the updated guidance follows that.

06 and part of 07, however, require you to fill the transfer case up to the fill port, then add an additional 250 ml through the speed sensor port if the vehicle VIN is prior to 56TDN136068105387. You say it's an 07, so be sure to check this.

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u/cactire 1d ago

it's one of the earlier 07's so it has the same requirements of the 06's. Does that mean we don't need GL-3 fluid in specific? because that's what has been challenging to find.

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u/dublAwrong 15h ago

Redline mt90 saved my ar5 and every other manual trans I’ve owned.