Question about gear oil

UsedToBeAChevyman · #1 (**permalink**) 09-10-2007, 05:23 PM

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?

willypscustoms · #2 (**permalink**) 09-11-2007, 01:14 AM

bump for some help

95BLKLSC · #3 (**permalink**) 09-11-2007, 01:48 AM

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.

**SCUFFY828** · #4 (**permalink**) 09-11-2007, 03:07 AM

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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