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Fluid weight difference - Owner's Manual vs. Motorcraft

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Old 05-12-2014, 05:28 PM   #1
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Default Fluid weight difference - Owner's Manual vs. Motorcraft

So I'm trying to order differential fluid for both the front and rear diff and I'm getting two different numbers. My owner's manual says to use 80w-90 front and rear and motorcraft.com says to use the following:

"Part Description: (Motor Oils And Lubricants Usa Usage); Hypoid gear lubricant - ""Use 75W140 synthetic oil ONLY'' "

I know this subject gets beat to death, but I wonder why the difference in weights? Did Ford come to some new understanding?
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Old 05-12-2014, 08:14 PM   #2
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They didn't use synthetics when our trucks were new.
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Old 05-12-2014, 08:36 PM   #3
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Originally Posted by Just call me Sean View Post
They didn't use synthetics when our trucks were new.
So does Ford now recommend this new weight and synthetic? Front and rear?
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Old 05-12-2014, 11:18 PM   #4
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As far as I knew only Lightning trucks recommended 75W-140 GL5. Everything else is 80w-90 with or without 4 oz of trac modifier If you have an LS.
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Old 05-13-2014, 01:45 AM   #5
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I looked at the motorcraft part number notes and it looks like at one point it had been replaced by 75w-90. But all the numbers are discontinued.

I may just stick with synth 75w-90 since it's closet to the manual.
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Old 05-13-2014, 03:23 PM   #6
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Quote:
Originally Posted by ScaldedApe View Post
I looked at the motorcraft part number notes and it looks like at one point it had been replaced by 75w-90. But all the numbers are discontinued.

I may just stick with synth 75w-90 since it's closet to the manual.
I use 75w-90 with no issues.
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Old 05-20-2014, 10:56 PM   #7
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lightning's were 75w140 all others were 80w90. but 75w90 is a great alternative.
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