Question about gear oil - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 09-10-2007, 06:23 PM Thread Starter
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Question about gear oil

Would it be ok to use 85W-140 instead of 75W-140? I can't tell a difference, maybe someone can fill me in on the difference. I'm putting something in it tomorrow so I need some replies. Thanks. Also, my truck is a 99 F-350 SRW, how can you tell if it is limited slip, which I think it is?
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post #2 of 4 Old 09-11-2007, 02:14 AM
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bump for some help

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post #3 of 4 Old 09-11-2007, 02:48 AM
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I'm not sure about these trucks as they are new to me but I have a lincoln that required 75-140 and I used 85-140 when I switched out to 3.73 a few years ago with no ill effects.
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post #4 of 4 Old 09-11-2007, 04:07 AM
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wil not hurt a thing and your rear end is limited slip so might want to add some friction modifier in with fluid , need about 8-10 ounces

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