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11-19-2009, 09:17 PM
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Hummer Expert
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Join Date: Sep 2007
Location: Mason, OH
Posts: 779
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Re: Rear diff fluid
I replaced my front diff fluid with 75-90. Should not be that hard to find and do. In fact the diffs in the H2 don't even need any special additives as they do not have LSD's.
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11-19-2009, 10:07 PM
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Hummer Authority
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Join Date: Oct 2003
Posts: 1,118
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Re: Rear diff fluid
Drained and refilled both diffs 3/27/05 at 29,795 miles with Mobile Synthetic Gear Lube LS 75W-90 and now have 86,624 miles on it and have no probs..... so far. Front diff does have slow leak and when I do the oil changes, I just top it off if required.
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11-20-2009, 02:38 AM
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Hummer Veteran
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Join Date: Feb 2009
Posts: 194
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Re: Rear diff fluid
Quote:
Originally Posted by Easy Ed
Drained and refilled both diffs 3/27/05 at 29,795 miles with Mobile Synthetic Gear Lube LS 75W-90 and now have 86,624 miles on it and have no probs..... so far. Front diff does have slow leak and when I do the oil changes, I just top it off if required.
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When my warranty is up and I change the fluid again, I will go with the Mobil BUT because even Mobil advises that there geral oil does not meet the GM specs, I am not risking a reason for Hummer to deny a warranty claim should I have a differential failure
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11-20-2009, 03:23 AM
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Hummer Authority
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Join Date: Oct 2003
Posts: 1,118
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Re: Rear diff fluid
Understandable....
Quote:
Originally Posted by Luv2Camp
When my warranty is up and I change the fluid again, I will go with the Mobil BUT because even Mobil advises that there geral oil does not meet the GM specs, I am not risking a reason for Hummer to deny a warranty claim should I have a differential failure
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11-20-2009, 01:38 PM
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Hummer Veteran
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Join Date: Aug 2009
Location: NE US
Posts: 124
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Re: Rear diff fluid
What does the manual spec for quantity in the rear diff ?
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11-20-2009, 02:46 PM
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Hummer Authority
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Join Date: Oct 2003
Posts: 1,118
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Re: Rear diff fluid
Service Manual for 2003 shows the rear holding approx. 4.0 Pints/1.9 Liters
Just for the future, front holds approx. 2.6 Pints/0.8 Liters
Quote:
Originally Posted by GRTWHT1
What does the manual spec for quantity in the rear diff ?
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11-20-2009, 03:55 PM
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Hummer Expert
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Join Date: Sep 2007
Location: Mason, OH
Posts: 779
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Re: Rear diff fluid
I just fill it until it starts to come out of the fill hole.
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11-20-2009, 05:26 PM
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Hummer Authority
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Join Date: Oct 2004
Location: Houston, TX
Posts: 1,290
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Re: Rear diff fluid
Quote:
Originally Posted by GRTWHT1
What does the manual spec for quantity in the rear diff ?
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Just in case....PML shows that their H2 cover's capacity is 1/2-quart over the stock cover.
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11-20-2009, 08:28 PM
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Hummer Veteran
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Join Date: Aug 2009
Location: NE US
Posts: 124
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Re: Rear diff fluid
Thanks TXSUT I haven't been home long enough to even open the parts bag.
Figured I could poke around here and get some info.
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07 SUT birch white LUX
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