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Old 04-20-2012, 06:41 PM   #1
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Question dumb question, cant find exact answer. Diff fluid?

I am changing my diff covers, and I am trying to figure out exactly what diff fluid I need to put in the front and rear.

I have a 2011 JKU Rubicon.

The "book" that came with the jeep is not very helpful in stating what I should be putting in.

Please help, would like to run out and get this tonight

Thank you!

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Old 04-20-2012, 06:47 PM   #2
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Old 04-20-2012, 06:48 PM   #3
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Did you look at the DVD that came with the Jeep? It has the full owners manual on there with all the info. you need for what fluids go into your Jeep.

For the diff's you need SAE 80W-90(API GL-5)
Models equipped with Trac-Lok require an additive (though some diff fluids have an additive in them already)
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Old 04-20-2012, 06:50 PM   #4
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Quote:
Originally Posted by wrangler0 View Post
Did you look at the DVD that came with the Jeep? It has the full owners manual on there with all the info. you need for what fluids go into your Jeep.

For the diff's you need SAE 80W-90(API GL-5)
Models equipped with Trac-Lok require an additive (though some diff fluids have an additive in them already)
I unfortunately do not have any DVD.

What about Trac-lok? I dont have trac-lok since its a rubicon?
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Old 04-20-2012, 06:56 PM   #5
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Originally Posted by Johnnyp View Post
I unfortunately do not have any DVD.

What about Trac-lok? I dont have trac-lok since its a rubicon?
You can download the full manual for your Jeep
My Jeep: Jeep Owners Service Manuals - 4x4 SUVs, Sports Utility Vehicles, Off Road

I have a 2010 Sahara, no trac-lock, so I'm not sure what a 2011 Rubi has in the rear.
Your front diff just needs the regular ol fluid I listed below, it's the rear that would need an additive if you have trac-lok.

Do you have your build sheet? It would say on there what you have
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Old 04-20-2012, 07:01 PM   #6
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Quote:
Originally Posted by wrangler0 View Post
You can download the full manual for your Jeep
My Jeep: Jeep Owners Service Manuals - 4x4 SUVs, Sports Utility Vehicles, Off Road

I have a 2010 Sahara, no trac-lock, so I'm not sure what a 2011 Rubi has in the rear.
Your front diff just needs the regular ol fluid I listed below, it's the rear that would need an additive if you have trac-lok.

Do you have your build sheet? It would say on there what you have
Thanks for that link.

Yes I am looking at the build sheet. I do not see the words "Track-lok" anywhere.

I see Tru-Lok and Rock-Trac, no Track-lok
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Old 04-20-2012, 07:07 PM   #7
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oh wait, you have a rubi so you have lockers....that's what Tru-Lok is, axles that actually lock so the wheels rotate at the same speed when engaged

Trac-Lok is a limited slip differential, don't ask me about the details but...you don't have that on your rubi

You should be good to go!
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Old 04-20-2012, 07:10 PM   #8
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Originally Posted by wrangler0 View Post
oh wait, you have a rubi so you have lockers....

I'm pretty sure you don't need to worry about any additives

Trac-Lok is a limited slip differential, don't ask me about the details but...you don't have that on your rubi

You should be good to go!
Oh, thats what Trac-lok is!
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Old 04-20-2012, 10:28 PM   #9
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Manual recommends a synthetic--75w-90 for normal abuse and 75w-140 for extended, towing/off-road-etc

I use Valvoline 75w-140 in my diffs--good stuff !

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Old 04-20-2012, 10:34 PM   #10
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The correct weight is actually 75W 90. If you tow you should use 75W 140 in the rear. I use it front and rear. The owner's manual is on the DVD and tr www.jeep.com.

Project-JK.com - Jeep JK Wrangler Resource » Jeep JK Wrangler Maintenance Differential Fluid Change Write-Up
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Old 04-20-2012, 10:45 PM   #11
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The '08 Owners Manual and FSM call for 80w-90 F/R unless you tow then use synthetic 75W-140 in the rear. Many (including myself) use 75W-90 synthetic.
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Old 04-21-2012, 01:54 AM   #12
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2010 takes 80W-90
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Old 04-21-2012, 05:49 AM   #13
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Currently running dino 85-140 in both.
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Old 04-21-2012, 06:09 AM   #14
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The parts Manager at my dealer ask me to bring my vin# and so he could sell me the correct fluid for my Jeep.He said because of all the different differentials that would be the best way to get the right fluid.
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Old 04-21-2012, 05:53 PM   #15
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Quote:
Originally Posted by jeepe
The parts Manager at my dealer ask me to bring my vin# and so he could sell me the correct fluid for my Jeep.He said because of all the different differentials that would be the best way to get the right fluid.
BS!
It says what you need in your owners manual.
Unless you wana pay way more than you need to, don't buy from the dealer.
These fluids are readily available at all auto parts stores.
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Old 04-22-2012, 09:48 PM   #16
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So what I dont get it is.. I followed this tutorial :Project-JK.com - Jeep JK Wrangler Resource » Jeep JK Wrangler Maintenance Differential Fluid Change Write-Up

And it says:

Front Differential Capacity:
2.7 pints (1.35 quarts)
Rear Differential Capacity:
4.75 pints (2.375 quarts)


So, I have a rubicon, Dana 44 front and rear as this article states "Jeep JK Wrangler Dana 30, or Dana 44."


Now I took out basically a gallon of fluid. And put back in less.



Why do you put less in the front? Was this the correct thing to do?


GAH
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Old 04-22-2012, 10:02 PM   #17
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The person who wrote that does have D44 front and rear. Scroll down and read some of the question and answers. If you have stock covers, fill the differentials until it starts to come out.
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Old 04-23-2012, 12:10 AM   #18
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Aftermarket diff covers usually have a Fill plug, and a Fill Level plug - and a drain plug. Check my photo, just to the right of the 223 - that's the Fill Level plug. Pour the fluid (and fluid additive - required) in the big plug at the top and quit when it's ready to run out the Fill Level hole. Aftermarket diff covers allow for more capacity, so the stock quantities don't mean a thing. Your local NAPA/whatever parts store should know exactly what gear oil and additive you need.
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Old 04-23-2012, 12:27 AM   #19
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Quote:
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...So, I have a rubicon, Dana 44 front and rear...Why do you put less in the front?...
In the front you are only putting oil in the pumpkin area, in the rear the oil goes out into the tubes.

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