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Unread 07-26-2015, 06:19 PM   #1
jdg80129
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Differential Question...

I have a '99 TJ with Dana 44 Axle Housings front and back, air lockers and 4:88:1 gearing. I've always wondered what is the very best lubricant is...any thoughts?

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Unread 07-26-2015, 09:18 PM   #2
2jhanna
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I think your making it harder than it is.

Any approved GL5, 80/90 weight should be fine.

It's been mentioned here that synthetics don't remove heat as well as non synthetics.
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Unread 07-26-2015, 09:23 PM   #3
Knuckelhead
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Quote:
Originally Posted by jdg80129 View Post
I have a '99 TJ with Dana 44 Axle Housings front and back, air lockers and 4:88:1 gearing. I've always wondered what is the very best lubricant is...any thoughts?
Why not put that information in your profile to help with future questions?...
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Unread 07-26-2015, 10:48 PM   #4
geroux
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Originally Posted by Knuckelhead View Post
Why not put that information in your profile to help with future question?...
Profile police!

The information is provided pertinent to what was asked. Why the harassment?
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Unread 07-26-2015, 11:00 PM   #5
mrblaine
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Quote:
Originally Posted by jdg80129 View Post
I have a '99 TJ with Dana 44 Axle Housings front and back, air lockers and 4:88:1 gearing. I've always wondered what is the very best lubricant is...any thoughts?
If the front is a Rubi low pinion 44, I'd strongly urge you to run the factory recommended synthetic in it of your choice.

We've seen too many of them smoke the pinion bearings when run with dino and I'm not a synthetic fan with two exceptions. Front Rubi 44's and the rear axle in my 05 Dodge 3500 4x.
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Unread 07-26-2015, 11:08 PM   #6
Knuckelhead
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Profile police!

The information is provided pertinent to what was asked. Why the harassment?
Typing while looking at your keyboard through a bottle again,
you truly crack me up.

Filling in ones profile helps every time someone asks a question...
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Unread 07-26-2015, 11:12 PM   #7
geroux
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Originally Posted by mrblaine View Post
If the front is a Rubi low pinion 44, I'd strongly urge you to run the factory recommended synthetic in it of your choice.

We've seen too many of them smoke the pinion bearings when run with dino and I'm not a synthetic fan with two exceptions. Front Rubi 44's and the rear axle in my 05 Dodge 3500 4x.
If they are Rubi D44 with Tru-lok... 75W-140 full synthetic per the FSM.
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Unread 07-27-2015, 12:32 PM   #8
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Originally Posted by mrblaine View Post
If the front is a Rubi low pinion 44, I'd strongly urge you to run the factory recommended synthetic in it of your choice.

We've seen too many of them smoke the pinion bearings when run with dino and I'm not a synthetic fan with two exceptions. Front Rubi 44's and the rear axle in my 05 Dodge 3500 4x.
Have you figured out why the dino oil is not good enough>? I ask cause I dont know.
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Unread 07-27-2015, 04:08 PM   #9
mrblaine
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Have you figured out why the dino oil is not good enough>? I ask cause I dont know.
No, but I do know that having a tow truck drop a rig off at my house with a locked up front axle is not something I'd like to deal with again.
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Unread 07-27-2015, 04:19 PM   #10
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Originally Posted by mrblaine View Post
If the front is a Rubi low pinion 44, I'd strongly urge you to run the factory recommended synthetic in it of your choice.

We've seen too many of them smoke the pinion bearings when run with dino and I'm not a synthetic fan with two exceptions. Front Rubi 44's and the rear axle in my 05 Dodge 3500 4x.
Excellent to know, glad I checked out this thread.
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Unread 07-27-2015, 10:25 PM   #11
geroux
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If someone said use extra virgin olive oil, would you use it? It seems some folks will use what whoever has the most posts uses.
I stick to what my FSM recommends or equivalent.
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Unread 07-27-2015, 10:50 PM   #12
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Originally Posted by geroux
If someone said use extra virgin olive oil, would you use it? It seems some folks will use what whoever has the most posts uses.
I stick to what my FSM recommends or equivalent.
Of course you don't use extra virgin olive oil, the flash point is too low... stick with canola.
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Unread 07-27-2015, 11:03 PM   #13
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If someone said use extra virgin olive oil, would you use it? It seems some folks will use what whoever has the most posts uses.
I stick to what my FSM recommends or equivalent.
If the guy that is my warranty center tells me to use cat poo thinned with peanut butter, yes I will. He's on the hook for the repair, parts and labor so you can bet I will listen to him.
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Unread 07-27-2015, 11:47 PM   #14
geroux
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If the guy that is my warranty center tells me to use cat poo thinned with peanut butter, yes I will. He's on the hook for the repair, parts and labor so you can bet I will listen to him.
I wasn't referring to who was warranting their work. Please re-read what I wrote.

However, if cat poo thinned with peanut butter was recommended or even extra virgin olive oil, I would have to question that and refer to my FSM.
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Unread 07-28-2015, 07:32 AM   #15
mrblaine
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Quote:
Originally Posted by geroux View Post
If someone said use extra virgin olive oil, would you use it? It seems some folks will use what whoever has the most posts uses.
I stick to what my FSM recommends or equivalent.
Quote:
Originally Posted by geroux View Post
I wasn't referring to who was warranting their work. Please re-read what I wrote.

However, if cat poo thinned with peanut butter was recommended or even extra virgin olive oil, I would have to question that and refer to my FSM.
I read the question and since you quoted no-one, I guessed that the question was without context so I did answer it as you wrote it. Not only would I use extra virgin olive oil, I would use whatever was recommended by the guy doing the warranty on the gears he just set up.

Now, if you meant I had stock gears, stock locker, and stock axles, then I would follow whatever the owner's manual or FSM recommended as they are supplying the warranty.

Identical to the steering stuff I do for folks. I tell them what to run for PS fluid. If they decide that the FSM is more right than I am and decide to run anything but what I tell them to and burn it up, it won't be fixed by me for anything less than full price.
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