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Diff. fluid....front and rear

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Old Dec 12, 2004 | 10:32 AM
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From: George West, Texas....
Diff. fluid....front and rear

I have heard the mfg,s use synthetic's in the diff.'s ..Was that true for the '99 F-250 4x4 ?
 
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Old Dec 12, 2004 | 10:49 AM
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rear 75-140 synth
front 85-90 non synth. but use synth anyways.
 
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Old Dec 13, 2004 | 10:50 AM
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i use amsoil synth in both
 
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Old Dec 13, 2004 | 10:52 AM
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Originally Posted by 99f350sd
rear 75-140 synth
front 85-90 non synth. but use synth anyways.
That and if you have a limited slip rear - make sure you get the friction modifier.
 
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Old Dec 13, 2004 | 11:54 AM
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yea forgot to mention that sorry
 
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Old Dec 13, 2004 | 12:43 PM
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From: George West, Texas....
So I can use Amsoil in both ?? The same weight ?? Or do I need different weights ??
 
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Old Dec 13, 2004 | 01:12 PM
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The rear shoiuld have 75 140 cause its severe use. the front could have the same but the rear shouldn't have 80/90.
 
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