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Go Back   Hummer Forums by Elcova > Hummer H2 Discussion Forums > Technical Discussion and Customizing your H2

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  #1  
Old 11-19-2009, 06:48 PM
Easy Ed Easy Ed is offline
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Default Re: Rear diff fluid

2003 Owners Manual shows for the front and rear diff.

SAE 75W-90 Synthetic
Axle Lubricant
(GM Part No. U.S. 12378261,
in Canada 10953455) or equivalent
meeting GM Specifications 9986115

Last edited by Easy Ed : 11-19-2009 at 06:54 PM.
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  #2  
Old 11-19-2009, 07:01 PM
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GRTWHT1 GRTWHT1 is offline
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Default Re: Rear diff fluid

Thanks Ed, the 75w 140 was in my f-350
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Old 11-19-2009, 08:43 PM
Luv2Camp Luv2Camp is offline
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Default Re: Rear diff fluid

Just know that, to my knowledge, there is NO 75-90 gear oil out there that meets GM specs listed in the manual. GM also makes their fluid smell like grapes (I am NOT kidding) This is an easy way for them to tell when they drain the fluid if it is genuine GM fluid or not just by the smell test! The stuff is not cheap either..
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Old 11-19-2009, 09:17 PM
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Default 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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Old 11-19-2009, 10:07 PM
Easy Ed Easy Ed is offline
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Default 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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Old 11-20-2009, 02:38 AM
Luv2Camp Luv2Camp is offline
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Default 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.


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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Old 11-20-2009, 03:23 AM
Easy Ed Easy Ed is offline
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Default 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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