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Rear Diff Service Pending - Replacement Diff Cover, Gasket Question

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Old May 26, 2021 | 10:27 AM
  #1  
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Rear Diff Service Pending - Replacement Diff Cover, Gasket Question

Thinking about installing this when I do my rear diff service soon on my 2011 Expedition.

https://performanceparts.ford.com/part/M-4033-F975

Along with a LubeLocker gasket.

First question: It looks like it has two fill plugs? Which one do I use, the higher or lower one? I don't want to underfill my diff, but I don't want to overfill it, either?

Second question: Am I correct in my memory that a LubeLocker gasket does not require any sealant/silicone RTV stuffs, that the gasket does the entire job itself?

Thank you!
 
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Old May 26, 2021 | 10:43 AM
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I have a 2010 Navigator, bought the G2 cover and Lube Locker gasket. Have not put it on yet, but I have a road trip coming so I need to.

The instructions for my cover say to fill it to the first hole unless it's got a big lift on it.

The instructions for the Lube Locker say to put it on dry.
 
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Old May 26, 2021 | 12:16 PM
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Awesome, thank you!! I'll get mine on order now!

Very much appreciated!
 
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Old May 26, 2021 | 12:36 PM
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The cover on the expedition since 2003 isn't able to be replaced with a aftermarket. In 2007 it got another design change and the suspension now bolts to the cover. The covers also have had a drain plug since 2003 so there is no need to pull the cover. Here is the 2007+ rear section (upside down).


 
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Old May 28, 2021 | 10:46 AM
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Well, crap.

Is the Navigator not similar?

I ordered the cover, and it's already on it's way - no way of cancelling now, and if the seller accepts returns, I'll undoubtedly eat part of the price on the return (not to mention return shipping).

There's a cross-member in the way, and I don't have the ability to jack up the rear at the moment to confirm, but do all 2011 Expeditions have a diff as pictured above?
 
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Old May 28, 2021 | 11:11 AM
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Yeah, I guess they do...
 
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Old May 28, 2021 | 03:37 PM
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Yes both the expedition and navigator since 2003 are the same. The cover is a key component to the rear suspension.
 
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