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Doing Differential Service - Have ?'s

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Old 07-10-2015, 10:41 AM
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what techrep said haha
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Old 07-10-2015, 10:54 AM
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Originally Posted by corey_lax
Depends how often you use 4x4 or if you have submerged the front diff. That oil would be brand new if you hardly use 4x4. But if you've ever dunked her under water, you might want to change it for piece of mind.

I just changed my rear diff oil along with a new pinion seal. I used Royal Purple 75w 140 and the Ford Friction modifier. Took just over 3 quarts.
You mean 2 quarts...
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Old 07-10-2015, 11:19 AM
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Originally Posted by techrep
You mean 2 quarts...
That is what I was hoping. 3 seems to be too much.
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Old 07-10-2015, 11:22 AM
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Originally Posted by techrep
It should be done with the rear, although you don't drive around in 4WD much, but ...especially when the truck has been submerged in water...the front is a bit more of a pain, gotta remove the skid plate.
Well, crap.... looks like I should probably schedule to do that one as well. The 4x4 has not been used that much and I have not had it completely submersed under water, but I should do it for piece of mind.

How hard is it to remove the skid plate? Any surprises that I should know about?

Thanks!
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Old 07-10-2015, 12:24 PM
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Easy to take the skid plate off. You will need some long extensions to get to some of the top bolts of the front diff but over all pretty easy. Takes a little finagling to slid the cover off. Same as rear diff use permatex to seal it back up. Front takes 75w-90 2 quarts should be enough, no additive needed.

TechRep mine took about 3.5 quarts.
Last edited by chayes627; 07-10-2015 at 12:28 PM.
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Old 07-10-2015, 03:26 PM
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Originally Posted by chayes627
Easy to take the skid plate off. You will need some long extensions to get to some of the top bolts of the front diff but over all pretty easy. Takes a little finagling to slid the cover off. Same as rear diff use permatex to seal it back up. Front takes 75w-90 2 quarts should be enough, no additive needed.

TechRep mine took about 3.5 quarts.
Is it possible to pump the fluid out of the front? I know you can't for the rear.
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Old 07-11-2015, 12:14 AM
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My rear 3.55 LS took all of 3 quarts of Mobile 1 Full Synthetic 75W-140 and a bottle of Motorcraft XL-3 friction modifier.
Last edited by Summers22; 07-11-2015 at 09:14 PM.
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Old 07-11-2015, 12:16 AM
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Default Doing Differential Service - Have ?'s
Check out Lube Locker. They make reusable gaskets for diffs.
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Old 07-11-2015, 01:04 AM
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I'm hearing everything between 2-4 quarts for the rear. Any clarification? I have an 04 fx4 3.73
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Old 07-11-2015, 07:48 AM
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im pretty sure my 9:75 W/ 3:73 LS holds 5.5 pints which = 2.75 quarts - 4 ozs of friction modifier..
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