Gear oil recommendation
#1
10-11-2017, 05:21 PM
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#2
10-11-2017, 07:30 PM
Champion
All Dodge truck rear axles contain SAE 80W-90 multipurpose type gear lubricant when delivered from the factory.
Anticiptated Temperature Range Recommended SAE Grade
Above 90F/32C SAE 140, SAE 80W-140, SAE 85W-140
As low as -10F (-23C) SAE 90, SAE 80W-90, SAE 80W-140, SAE 85W-140
Below -10F (-23C) SAE 75W, SAE 75W90, SAE 80W, SAE 80W-140
Above 90F/32C SAE 140, SAE 80W-140, SAE 85W-140
As low as -10F (-23C) SAE 90, SAE 80W-90, SAE 80W-140, SAE 85W-140
Below -10F (-23C) SAE 75W, SAE 75W90, SAE 80W, SAE 80W-140
RwP
#3
10-12-2017, 10:01 AM
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#4
10-12-2017, 10:07 AM
I don't believe the 7.25 ever came with a limited slip so you do not need the friction modifier. Conventional vs synthetic...everybody has an opinion on that but for gear oil my inclination is that it doesn't really matter, except perhaps when differentials are put to extreme use, then maybe it's wise to consider fluids carefully. But you're not going to be putting the 7.25 to any kind of extreme use.
#5
10-12-2017, 01:34 PM
Champion
I don't believe the 7.25 ever came with a limited slip so you do not need the friction modifier. Conventional vs synthetic...everybody has an opinion on that but for gear oil my inclination is that it doesn't really matter, except perhaps when differentials are put to extreme use, then maybe it's wise to consider fluids carefully. But you're not going to be putting the 7.25 to any kind of extreme use.
It'll probably be 75W140 today; I don't think you can even FIND 80W140 gear oil anymore.
As to the "extreme use", if you NEED synthetic in your truck's rear end, you also NEED something bigger than a 7.25. (That;'s proveable, BTW, not just an opinion.)
RwP
#6
10-12-2017, 01:45 PM
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That's right! I mean't to type 85W-140. I will most likely with Valvoline 85W-140. I greatly appreciate the info! Might change the rear diff fluid this Saturday!
I'd use synthetic, but as tbugden says, it really doesn't matter.
It'll probably be 75W140 today; I don't think you can even FIND 80W140 gear oil anymore.
As to the "extreme use", if you NEED synthetic in your truck's rear end, you also NEED something bigger than a 7.25. (That;'s proveable, BTW, not just an opinion.)
RwP
It'll probably be 75W140 today; I don't think you can even FIND 80W140 gear oil anymore.
As to the "extreme use", if you NEED synthetic in your truck's rear end, you also NEED something bigger than a 7.25. (That;'s proveable, BTW, not just an opinion.)
RwP