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Old 06-20-2014, 07:06 PM
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2003 rear diff fluid ?

So going to change my fluids in the front and rear diff. Now what is the best gear oil for it and how much friction modifer to use in the rear.Read the foward needs none is that correct? Planning to probally use amsoil.
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Old 06-20-2014, 07:18 PM
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if u use amsoil u won't likley need modifier

if u have some limited slip chatter around corners then u need the Amsoil LS additive

make sure u use the proper weight front and rear no matter what brand u use

forward is an open diff it needs no additive
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Old 06-20-2014, 07:28 PM
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Thanks zman thats what I was looking for going to use 75-140 rear and 75-90 for the front just getting ready for the move to alaska
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Old 06-28-2014, 10:46 PM
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Go with AMSOIL Sever Gear. Great Stuff! I run 75-140 in front and rear. I would burn up Motorcraft gear oil way happier since I switched to Severe Gear.

And ZMANN is spot on [QUOTE=ZMANN;9439153]if u use amsoil u won't likley need modifier

if u have some limited slip chatter around corners then u need the Amsoil LS additive
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