Rear Differential fluid? - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 33 (permalink) Old 01-27-2020, 08:15 PM Thread Starter
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Rear Differential fluid?

I've always paid someone to change mine but that would be kinda dumb now that I have a shop with a 2 post lift.

So what are you guys using?

2002 Chevy 2500HD Crew - Original owner - 408,000 miles so far. All stock with the exception of a lift pump.
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post #2 of 33 (permalink) Old 01-27-2020, 08:25 PM
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You don't need a lift to change the diff fluid. Drain plug on bottom, fill with 3.5qts syn 75w-90.
No need to remove the diff cover.

I've used Mob-1 and currently running Schaeffer's.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
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Last edited by Hook'em_Horns!; 01-27-2020 at 08:30 PM.
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post #3 of 33 (permalink) Old 01-27-2020, 08:37 PM
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Put a floor jack under the hitch and lift the body up. Tires stay on the ground. Even my fat ass fits under there.....
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post #4 of 33 (permalink) Old 01-27-2020, 08:41 PM
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Mobil 1 on mine currently

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2008 CCLB LMM
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post #5 of 33 (permalink) Old 01-27-2020, 10:36 PM
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If hes got a lift why not use it? Mobil 1 here too though.

Race/Pulling truck- 2012 CCSB Cummins/Built Engine/
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post #6 of 33 (permalink) Old 01-28-2020, 05:47 AM
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Surprised there's no recommendations for the GM grape juice and wonder why. Is it just the price? Doesn't seem like any of it is cheap.

2012 3500 4X4 CCLB
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post #7 of 33 (permalink) Old 01-28-2020, 06:24 AM
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I've watched the Dealer service it.....pouring in bottles of Mob-1
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2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"
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post #8 of 33 (permalink) Old 01-28-2020, 06:46 AM
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Used Mobil Delvac 75w-90 synthetic. 12.5 pints. I have a small handpump that fits in the jugs.

2019 Chevrolet 4500HD CC 4X4 Flatbed
2018 Chevrolet 1500 CC 4X4 High Country 6.2 liter
2019 Chevrolet 3500HD CC 4X4 Flatbed--SOLD
2011 Peterbilt 337 hauler with 360HP 8.3 Cummins--SOLD
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post #9 of 33 (permalink) Old 01-28-2020, 08:02 AM
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Not sure if there is any difference in requirements between a regular diff and the G80 option. I know the G80 option (Z71 and such) use the 75w-90 synthetic. I used the Mobil 1 stuff with a cheap hand pump that you find at the local auto store. Worked really well for that and the transfer case. I bought two of those pumps since the transfer case uses tranny fluid. Dean
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post #10 of 33 (permalink) Old 01-28-2020, 08:30 AM
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I'm using Amsoil right now, I liked that they have the bags of oil so it's easier to get in there to pour.
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