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Old 08-24-2012, 02:50 PM   #1
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differential fluid amount question.

So I installed a new g2 front diff cover and filled it up till it over flowed. Then after three weeks of driving on the highway all my diff fluid blew put the breather tube and had to get a tow and refill. The mechanic said it was overfilled. And it did take more fluid than the rear that had a slock cover. My question is with a new diff cover other than stock, will it fill up more with the new cover but you must fill up to stock level not till it over flows? You get my question I know it is worded bad.

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Old 08-24-2012, 03:00 PM   #2
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Yeah, you have to fill it with the stock amount of fluid or it will overflow.

I put Riddler covers on my old TJ and I had to measure out the proper amount of fluid to put in. Definitely not as easy as filling with the stock covers.

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Old 08-24-2012, 03:58 PM   #3
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Stock amount is minimum. With certain covers and increased pinion angle you should add more than stock, that is why they put the fill holes on aftermarket covers up higher. You didn't need to have the jeep towed and diff refilled, only the excess fluid blew out. It's a messy way of "figuring itself out".

Better to overfill it and have to clean a mess up than under fill it and have the fluid level not be high enough fill the tubes (if applicable) or properly lubricate the pinion bearings.
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Old 08-24-2012, 04:13 PM   #4
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Yep, you may change the volume a little with a new cover but you can only put so much in there before physics takes over and pressure builds. If the ring is in oil it will sling it everywhere it needs to be so it doesn't need to drown it or it will do what it did. (you are not the only one)
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Old 08-24-2012, 04:32 PM   #5
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The mechanic said it was good to toe. And without it I would need to rebuild my diff. I loss all my front diff fluid
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Old 08-24-2012, 06:08 PM   #6
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Did you see him pull the cover or add fluid back in? I believe he said that so he could sleep better that night.
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Old 08-24-2012, 06:16 PM   #7
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Unless it blew your seals out to, there's no way all your fluid came out the breather.
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Old 08-24-2012, 07:54 PM   #8
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No matter where the fill hole is, the axle seals are only so high. They hold fluid but not under pressure, so fill to spec or you will have issues. Remember, you have to push the axles thru the seals into the housing when assembling, they can only do what they are designed to do.
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Old 08-24-2012, 09:53 PM   #9
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Last week I replaced the stock cover on my front Dana 30 with a Solid brand heavy duty cover. The fill hole on the Solid cover is much higher up than the stock cover. It would probably take twice the amount of oil to fill to the level of the fill hole on the new cover.
I thought about this and decided the need for oil is the same regardless of the cover. The new cover's shape on the inside is about the same so the oil level should not be affected. I stayed with the amount stated in the owner's manual and would suggest it's best to do that. The engineers that designed the differential understood how they work and what lubrication they need.
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Old 08-24-2012, 10:03 PM   #10
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I didn't blow the seals on the cover but out the breather. I am pretty sure I blew out most of it. There was a huge puddle under the Jeep when I pulled over after about a mile after it happened. I guess I will go with stock. That is what I suspected.
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Old 08-25-2012, 12:15 PM   #11
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It would be wise, that you before refilling your Third Member, you check the Pinion shaft seal. Detecting a bad seal first is better than losing a differential!
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Old 09-18-2012, 02:07 PM   #12
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I am about to change the differential oil on my Rubi 2008. From an earlier thread and thank you so much for that post since my owner's manual doesn't tell how much oil to use, someone said use SAE 75W-90 Syn gear oil 2.75 Pints (1.35 qt) front and for the rear 4.75 pts (2.37 qt). Now after reading all these posts I am afraid I may blow my pinion shaft seal or something. Hmmmm should I just pay the dealer $300.00 Copying link from earlier post - Project-JK.com - Jeep JK Wrangler Resource » Jeep JK Wrangler Maintenance Differential Fluid Change Write-Up - this seems pretty easy. I am going to use SAE 80W-90 API GL-5 which my manual suggested.
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Old 09-18-2012, 04:16 PM   #13
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Quote:
Originally Posted by rustycj7jeep View Post
I am about to change the differential oil on my Rubi 2008. From an earlier thread and thank you so much for that post since my owner's manual doesn't tell how much oil to use, someone said use SAE 75W-90 Syn gear oil 2.75 Pints (1.35 qt) front and for the rear 4.75 pts (2.37 qt). Now after reading all these posts I am afraid I may blow my pinion shaft seal or something. Hmmmm should I just pay the dealer $300.00 Copying link from earlier post - Project-JK.com - Jeep JK Wrangler Resource » Jeep JK Wrangler Maintenance Differential Fluid Change Write-Up - this seems pretty easy. I am going to use SAE 80W-90 API GL-5 which my manual suggested.
No way would I pay that to have my diff fluid changed. Bring it to my house and I'll charge $100 Just fill it until it is even with the fill hole and your are done. There shouldn't be any way to overfill a diff unless you are parked on a very steep incline. I'm puzzled as to how the OP had it shooting out of the breather hose. Make sure to thoroughly clean the case and the cover so there is no old gasket to oil where the gasket is applied. If you want a faster and easier gasket look into lube lockers so you don't have to wait for them to cure.
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Old 09-18-2012, 06:48 PM   #14
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Quote:
Originally Posted by BLK00TJ
No way would I pay that to have my diff fluid changed. Bring it to my house and I'll charge $100 Just fill it until it is even with the fill hole and your are done. There shouldn't be any way to overfill a diff unless you are parked on a very steep incline. I'm puzzled as to how the OP had it shooting out of the breather hose. Make sure to thoroughly clean the case and the cover so there is no old gasket to oil where the gasket is applied. If you want a faster and easier gasket look into lube lockers so you don't have to wait for them to cure.
Mine blew out the breather because I have a g2 different cover and the fill hole is higher si it got over filled and blew out the breather.
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Old 09-18-2012, 06:53 PM   #15
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Quote:
Originally Posted by kylekae View Post
Mine blew out the breather because I have a g2 different cover and the fill hole is higher si it got over filled and blew out the breather.
I just looked them up and yes, that is way too high. I was expecting to see the kind that was made for the pinion angle on the rear covers. That hole puts you right up there where the breather tube is and would make sense why it would be pushed out.
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Old 09-18-2012, 06:55 PM   #16
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The stock Dana 44 Rubicon take 2 quarts of fluid right.
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Old 09-18-2012, 07:40 PM   #17
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Quote:
Originally Posted by kylekae View Post
The stock Dana 44 Rubicon take 2 quarts of fluid right.
Yes.
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Old 09-20-2012, 09:55 PM   #18
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2 quarts each front and rear. Not different amount?
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Old 09-20-2012, 11:09 PM   #19
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Front axle is less because of the the dry tubes.
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Old 09-21-2012, 03:03 AM   #20
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Originally Posted by freeskier View Post
Front axle is less because of the the dry tubes.

Not according to the factory service manual:


FRONT AXLE ±.03 L (1 oz.)

216 FBI (Model 44) 1.89 L (4.0 pts.)

REAR AXLE ±.03 L (1 oz.)

216 RBI (Model 44) 1.89 L (4.0 pts.)
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Old 09-21-2012, 03:45 AM   #21
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^ and ... my Chrysler FSM is a POS. They didn't pay the editor enough. My apologies for relaying the bad info.
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Old 09-21-2012, 06:21 AM   #22
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So how much do they take?
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Old 09-21-2012, 08:01 AM   #23
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I found that the front takes 1.3 quarts. I put in 2 will that be OK.

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