what weight do you use in your rear dif? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 24 (permalink) Old 02-08-2011, 03:38 AM Thread Starter
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what weight do you use in your rear dif?

I'm curious... I was thinking of going to a 85w140 in the rear diff.. I live in a moderate climate, never gets too cold (15F) or hot (90F).. so I think I'd get better protection out of this stuff since it's a bit "thicker".. Fully synthetic of course.

What do you use, and why? Not really interested in brand wars, as much as what viscosity? 75w90/110/140 or 85/90/110/140?

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post #2 of 24 (permalink) Old 02-08-2011, 03:42 PM Thread Starter
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seriously? No opinions on this? Or is this forum just too far tucked away from site?

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post #3 of 24 (permalink) Old 02-08-2011, 04:06 PM
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Ive havnt changed mine yet...lol so I havn't made that decision, but up here I think a thinner syn is the way to go for me, especially when the temps can dip to -30F, -40F

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post #4 of 24 (permalink) Old 02-08-2011, 04:08 PM Thread Starter
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yeah, you're in a whole different climate there.... gotta go with a thin one.

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post #5 of 24 (permalink) Old 02-08-2011, 06:20 PM
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My climate is very similar to yours and I ran 75W-90 in everything without ever having an issue.

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post #6 of 24 (permalink) Old 02-08-2011, 10:16 PM
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I use 75w-110 in rear and 75w-90 in the front. Guess I don't have to mention the brand I use.
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post #7 of 24 (permalink) Old 02-09-2011, 04:15 AM Thread Starter
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so nobody is a fan of stuff like RP's MaxGear 85W140? I heard it's the gold standard when it comes to gear protection, or was I misinformed?

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post #8 of 24 (permalink) Old 02-09-2011, 04:29 AM
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Quote:
Originally Posted by Syn-Herb View Post
I use 75w-110 in rear and 75w-90 in the front. Guess I don't have to mention the brand I use.
X2. I'm considering going back to 75w-90 in the rear. I hardly tow anymore.

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post #9 of 24 (permalink) Old 02-09-2011, 03:38 PM
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Check this out, The Study of Automotive Gear Lubes.

http://www.amsoil.com/lit/g2457.pdf
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post #10 of 24 (permalink) Old 02-09-2011, 03:49 PM Thread Starter
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Originally Posted by Syn-Herb View Post
Check this out, The Study of Automotive Gear Lubes.

http://www.amsoil.com/lit/g2457.pdf
what's odd to me about that is that I am told by a lot of different people how good Royal Purple is, and when I bought some it was at the advise of my local dealer mechanic... yet this shows it as the worse.. makes no sense.

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