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What diff fluid?

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Old 03-13-2013, 02:40 PM
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Default What diff fluid?
So I'm going to be changing my differential cover and I was wondering what kind of differential fluid to put back in? What's the best brand and what weight of oil? Thanks
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Old 03-13-2013, 04:09 PM
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A few questions: 2WD or 4WD? How do you use your truck? Constant towing? Street driven? Occasional towing? Any heavy hauling? Those factor into what weight to use.
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Old 03-13-2013, 05:24 PM
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Its 4wd and I do occasional towing with it less then 5,000 pounds.
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Old 03-13-2013, 06:39 PM
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Is it limited slip? If its limited slip you also need to add a friction modifier
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Old 03-13-2013, 06:42 PM
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The front diff fluid is different than the back I believe. If that make a diff to you.
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Old 03-13-2013, 07:06 PM
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Well I hear royal purple is a good fluid but what weight do I need?
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Old 03-13-2013, 09:52 PM
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I'm an Amsoil Severe Gear 75w-90 kinda guy. Royal Purple is good too. 75w-90 should be sufficient if towing is just occasional. If it's more than occasional, go with 75w-140.
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Old 03-13-2013, 10:00 PM
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So would there be any harm in running 75w-140 even if I don't tow a lot?
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Old 03-13-2013, 10:41 PM
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No it wouldn't do any harm. Maybe a minor decrease in gas mileage, but no it wouldn't hurt anything at all.
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Old 03-14-2013, 05:11 PM
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Where did you find the gear oil all the oil at autozone is for a limited slip and I Have a non lim slip
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