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Conventional 80W-90 or synthetic 75W-90?

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Old 10-24-2014, 03:14 AM
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Conventional 80W-90 or synthetic 75W-90?
I caught full synthetic 75w-90 on sale for a $1 more than regular 80w-90 gear lube. Is that ok to run in '01 f250's?
 
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Old 10-24-2014, 05:59 AM
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I don't see why not.....as long as the api rating is the same or better than what Ford calls for
 
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Old 10-24-2014, 07:04 AM
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Front axle only, rear axle takes 75-140 and if you have limited slip needs friction modifier or the additive in the fluid originally.
 
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Old 10-24-2014, 10:46 AM
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Originally Posted by Bently_Coop
Front axle only, rear axle takes 75-140 and if you have limited slip needs friction modifier or the additive in the fluid originally.
on my 05 and 08, Bently's comments were true. Not sure about your year vehicle.
 
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Old 10-24-2014, 12:51 PM
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Originally Posted by speakerfritz
on my 05 and 08, Bently's comments were true. Not sure about your year vehicle.
It is the same for the 99'-04' trucks also. Sterling 10.5 recommends 75-140. The Danas recommend the 75/80w90.
 
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Old 10-24-2014, 07:04 PM
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Ok, I swapped for some 75W-140 and it says "limited slip" on the label and on the back is says blah blah for hypoid differential and limited slip use blah blah. So, I'm assuming I won't need any other additives.
 
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Old 10-24-2014, 07:21 PM
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If you get chatter from the LSD you will want to add some friction modifier.
 
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Old 10-24-2014, 07:26 PM
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I think I have been getting some "chatter" from it already due to low fluid. It will like the rear end is bumping sometimes especially making a slow turn.
 
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Old 10-24-2014, 07:59 PM
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Originally Posted by bigcountry1009
I think I have been getting some "chatter" from it already due to low fluid. It will like the rear end is bumping sometimes especially making a slow turn.
you probably need some more friction modifier added.
 
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