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Old 10-11-2017, 05:21 PM
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Default Gear oil recommendation

What weight of gear oil should I use for my 88 Dakota 3.9 V6 2WD 7.25 rear end?
 
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Old 10-11-2017, 07:30 PM
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Originally Posted by Josh89Griffin View Post
What weight of gear oil should I use for my 88 Dakota 3.9 V6 2WD 7.25 rear end?
From the factory service manual, page 0-18 :

All Dodge truck rear axles contain SAE 80W-90 multipurpose type gear lubricant when delivered from the factory.
The actual weights depend on the temperatures you'll see. From the right side, same page:

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
Hope that helps some!

RwP
 
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Old 10-12-2017, 10:01 AM
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I want to do 80W-140, would I need to use a limited slip additive? Would I need to use regular 80W-140 or synthetic 80W-140? Thanks RalphP!
 
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Old 10-12-2017, 10:07 AM
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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.
 
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Old 10-12-2017, 01:34 PM
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Originally Posted by Josh89Griffin View Post
I want to do 80W-140, would I need to use a limited slip additive? Would I need to use regular 80W-140 or synthetic 80W-140? Thanks RalphP!
Originally Posted by tbugden View Post
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.
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
 
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Old 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!

Originally Posted by RalphP View Post
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
 
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