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Non-LS Diff fluid?

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Old Jul 3, 2012 | 12:04 AM
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Redneck911's Avatar
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From: Aggieland
Non-LS Diff fluid?
I don't have a LS diff in my 2004 STX.

I know it doesn't need the friction modifier. Lots of fluid has it already. I assume its cool if I use fluid with FM even though I don't need it.

Am I right?

Thanks!
 
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Old Jul 3, 2012 | 12:58 AM
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Yes, right. Gear oil however, should be the correct weight and ideally synthetic though.
 
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Old Jul 3, 2012 | 04:28 AM
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Mornin'.

I'd use a fluid without the FM added if you don't need it (no LS) - lots available.

Here's why:

https://www.f150online.com/forums/4773195-post5.html


MGD
 
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Old Jul 3, 2012 | 05:19 PM
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glc
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From: Joplin MO
75W140 full synthetic required.
 
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Old Jul 3, 2012 | 08:08 PM
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glc,

Try not to flame me too bad for a noob question

But how often should the fluid be changed in an open diff rear end?
 
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Old Jul 4, 2012 | 01:25 PM
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glc
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Ford says it's lifetime, but I'd change it every 100k. If you launch a boat with it and immerse the rear axle in the water, I'd change it right away.
 
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Old Jul 4, 2012 | 05:01 PM
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From: Aggieland
'Preciate it everyone!
 
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Old Jul 4, 2012 | 05:31 PM
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From: Byhalia, MS
Thanks, glc.

I'll have to look and see if the dealership has done anything; I'm at almost 107,000.
 
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Old Jul 6, 2012 | 07:54 AM
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From: Maine
Originally Posted by glc
75W140 full synthetic required.
Unless you have a Detroit Tru-Trac......thy require straight Dino Lube--80-90. NO SYNTHETIC
 
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