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Old 10-24-2006, 01:37 PM   #1 (permalink)
dumdawg
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Duramax rear differential oil capacity

I just changed the rear diff oil on my 2005 duramax and the book calls for a little over 3 quarts. However it took 4 quarts before the fluid was level with the check/fill plug? Is the capacity really only 3 quarts and did I over-fill? In every other rear-end you fill it until it comes out of the check hole.
thanks for any recommendations
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Old 10-24-2006, 02:09 PM   #2 (permalink)
BigStu128
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4 qts should be fine. I did the same in my LLY and the LBZ I own now.
There is plenty of room for the fluid to expand and a little more in there to distribute the heat around can't hurt.
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Old 10-24-2006, 11:21 PM   #3 (permalink)
ockgator
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GM usually underfills axles. Figure 1 pint times 1,000,000 trucks and there's a LOT of $$$ GM keeps in their pockets.
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Old 10-25-2006, 08:28 AM   #4 (permalink)
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4 qts is correct for the G80
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Old 10-25-2006, 08:47 AM   #5 (permalink)
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Actually, I believe the GM spec is 3.78 quarts (supposed to be about 1/2" below the fill hole). But 4 quarts pretty much brings it up to the bottom of the fill hole and is "close enough." Besides, what are you going to do with 0.22 quarts of leftover gear lube?
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Old 10-25-2006, 04:57 PM   #6 (permalink)
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Quote:
Originally Posted by Idle_Chatter;1371998;
Actually, I believe the GM spec is 3.78 quarts (supposed to be about 1/2" below the fill hole). But 4 quarts pretty much brings it up to the bottom of the fill hole and is "close enough." Besides, what are you going to do with 0.22 quarts of leftover gear lube?
After you drained out the old fluid, you could squirt in 0.22 quarts of new fluid to get out a little more old fluid before putting in all the new fluid. Just an idea...
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Old 10-27-2006, 04:59 PM   #7 (permalink)
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the non diesel diff will hold 3 litres , the diesel diff is larger and holds more fluid
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Old 10-28-2006, 09:58 PM   #8 (permalink)
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Quote:
Originally Posted by greenmax;1377497;
the non diesel diff will hold 3 litres , the diesel diff is larger and holds more fluid
So, the Duramax diesel 3500 dually differential is larger than the gasoline 3500 dually differential?
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Old 10-29-2006, 12:54 AM   #9 (permalink)
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Nope, Their both the same.

DEWFPO
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Old 10-29-2006, 12:56 PM   #10 (permalink)
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Quote:
Originally Posted by DEWFPO;1379901;
Nope, Their both the same.

DEWFPO
i parked beside a 2500 hd 6.0 ltr and my diff was bigger , the fill is in the rear cover , on the diff housing on the 6 ltr if it has the allison it will have the bigger diff
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