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Changed The Rear Fluid On My 2009 2500hd And Found Some Foam Inside? A

phillyturbosix

By phillyturbosix
in Ask A GM Technician

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phillyturbosix Enthusiast

phillyturbosix

Posted
Posted

Changed all the fluids on my 2009 2500HD over the weekend and found some foam in the rear when I took the cover off. Truck has 10K miles on it. It was about a 45 min ride to the shop. The truck sat for a little while before we opened it up but this is what it looked like when we popped the cover off. I've been told it's not normal. Any ideas? Do I need to be worried or go back to the dealer? The truck has never towed anything. I drive like a little old lady no less.

 

Original thread is here...

 

http://www.gm-trucks.com/forums/index.php?showtopic=130878

 

 

Here are some of the pics...

 

5625294297_6472787497_o.jpg

5625883596_146f9e6101_o.jpg

5625883896_3172168244_o.jpg

sm00thpapa Enthusiast

sm00thpapa

Posted
Posted

Never seen this on a differential but it is proven that this will happen with some synthetic oils in splash lubrication engines. Does your owners manual call for synthetic differential fluid? Do you know what was in there?

Black02Silverado Senior Enthusiast

Black02Silverado

Posted
Posted

Something isn't right with the fluid. There should not be any foam like that inside there. The gears are basically not getting any protection and defiantly not getting the cooling ability that they should be getting from the gear oil. :lol:

 

Show these pictures to any of the lube tech's at Redline, Mobil, Royal Purple and even AMSOIL and they will all tell you the same thing. There should not be any foam in there.

 

Good thing you changed out the fluid when you did. At least you can install a high quality synthetic and know it is being protected from here on out.

Z45 Senior Enthusiast

Z45

Posted
Posted

Foaming can happen in any lubricant and it not something unique to synthetics, maybe cheap synthetics. Its a sign the lube is not formulated with a good anti-foam additive or at least, not enough to last very long.

 

During differential operation, gears and bearings turn at high speeds which churn the lubricant. When air is introduced, foaming can occur. While gear lube is considered incompressible, air is compressible and when bubbles pass between loaded areas, the bubbles collapse and metal-to-metal contact occurs, causing wear. Foam can also increase friction and act as an insulator, which increases heat and oxidation. Good foam control is important in gear lubricants. In most cases, anti-foam additives are needed. The API has established maximum foam limits for GL-5 gear lubricants.

 

Keep in mind factory lubes are supplied by low bidder.

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