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Old 05-31-2013, 04:14 PM   #1
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Fill differencial through vent port?

I have 2004 Rubicon with Dana 44's in which I'm changing the fluid. I had no problems with the front however I can only get about 1 1/2 quarts in the rear. I was wondering if it would be possible to put the remaining 16oz in via the vent port? I'm open to any suggestions. I tried putting the rear tires on ramps in an effort to change the angle of the fill hole but this didn't work.

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Old 05-31-2013, 04:29 PM   #2
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could be wrong here, but I've never filled a rear end past the fill plug. Did you give it time to disperse and settle?

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Old 05-31-2013, 04:36 PM   #3
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She's still sitting on the ramps, I'll pull the fill plug and see if letting it sit for about 30 minutes makes a difference.
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Old 05-31-2013, 04:58 PM   #4
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If you overfill it the extra fluid will just push out the breather pipe and make a mess of things.
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Old 05-31-2013, 05:02 PM   #5
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Quote:
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If you overfill it the extra fluid will just push out the breather pipe and make a mess of things.
This, I learned by filling to fill plug on a riddler diff cover. The plug is higher and I have got a mess.
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Old 05-31-2013, 05:12 PM   #6
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I'm certainly not trying to overfill fill it, I've read several responses of guys dealing with that mess, just trying to get the recommended 2 quarts in.

My driveway sits at a pretty good slope to the street, so I pointed the front end downhill and pulled the rears up onto ramps. This set up allowed me to get an additional 8oz in, leaving me about 8oz shy of the full 2 quarts. Is this something I should leave well enough alone or be concerned that its not full to the recommended specs?
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Old 05-31-2013, 05:31 PM   #7
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It is filled adequately if it is filled to the bottom of the fill hole if you are running OE driveshafts.
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Old 05-31-2013, 05:38 PM   #8
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That's my concern Jerry, I'm running a 3" long arm with a 1" body. I have a Tom Woods driveshaft but concerned that the angle of the pumpkin is different then stock not allowing to be filled properly.
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Old 05-31-2013, 07:51 PM   #9
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That's my concern Jerry, I'm running a 3" long arm with a 1" body. I have a Tom Woods driveshaft but concerned that the angle of the pumpkin is different then stock not allowing to be filled properly.
I would add the rest through the breather plus some. The bigger issue is the pinion bearings, this is why aftermarket covers come with higher fill holes. With a higher pinion angle you want to have at a minimum the factory recommended amount plus some so that inner pinion bearing is still sitting in oil.
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Old 06-01-2013, 07:20 AM   #10
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Thank you for he advice freeskier, I'll do that then look into an aftermarket cover.
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Old 06-01-2013, 08:39 AM   #11
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My pinion angle is about 22° so I fill to the plug then add another half quart though the vent.


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This was recommended by the driveline shop that rebuilt the axle. I haven't had any pinion bearing problems or burping lube from the vent
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Old 06-02-2013, 09:42 AM   #12
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All Terrain TJ, do you simply remove the hose then pump it in? That's what it looks like in your photo, just wanted to be sure. Thanks for the help.

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