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Unread 01-21-2008, 08:09 AM   #1
1998TJI6
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How much fluid will Differential hold?

I am getting ready to change my differentail fluid. 75w-90 How much will front and rear hold?

Thanks

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Unread 01-21-2008, 08:13 AM   #2
robncar
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If you fill out your profile (Jeep Info) we'd know what axles you have...

D30 = 2.5 pints / 1.25 quarts
D35 = 3.5 pints / 1.75 quarts
D44 = 4.0 pints / 2.0 quarts
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Unread 01-21-2008, 08:16 AM   #3
Slithering_Joe
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Search item: "differential fluid capacity"
Search results #1: http://www.jeepforum.com/forum/f9/faq-fluid-capacities-489932/
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Unread 01-21-2008, 08:16 AM   #4
GreenJip
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I usually buy three to four quarts. to do front and rear. Just fill them until they start to come out of the fill hole and them put the plug in. You will probably have a little left, but that makes for good oil to take on your off road trips.
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Unread 01-21-2008, 08:34 AM   #5
2jhanna
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Quote:
Originally Posted by GreenJip
I usually buy three to four quarts. to do front and rear. Just fill them until they start to come out of the fill hole and them put the plug in. You will probably have a little left, but that makes for good oil to take on your off road trips.
most people tend to do this. it only pretains to manuals and t-cases. for tj's diffs, the bottom of the fill hole is approx 1/2" overfull.
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Unread 01-21-2008, 08:37 AM   #6
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Quote:
Originally Posted by 2jhanna
most people tend to do this. it only pretains to manuals and t-cases. for tj's diffs, the bottom of the fill hole is approx 1/2" overfull.
What would the ramifications be if it is 1/2" overfull?
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Unread 01-21-2008, 08:43 AM   #7
2jhanna
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i don't really know. maybe some fluid blowing out the vent tube ?? i know on most gearboxes, including diffs, the bottom of the fill hole is the correct level. but, on some, including our axles, it is overfull, our tj manuals state this point. it is much tougher to judge how much is in there.
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Unread 01-21-2008, 08:48 AM   #8
1998TJI6
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Thanks for the info.

I have a Haynes manual and it says if you loosen the bolts and drain it out you should remove the cover and clean it. Has anyone loosen the bolt to drain and just tightened the bolts back up without cleaning?
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Unread 01-21-2008, 08:52 AM   #9
2jhanna
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you will get leaks. the seal either rtv or gasket won't seal good again.
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Unread 01-21-2008, 08:53 AM   #10
Dravintoad
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Quote:
Originally Posted by 1998TJI6
Thanks for the info.

I have a Haynes manual and it says if you loosen the bolts and drain it out you should remove the cover and clean it. Has anyone loosen the bolt to drain and just tightened the bolts back up without cleaning?

You need to clean the surface and apply a new bead of RTV to that puppy.
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Unread 01-21-2008, 08:55 AM   #11
robncar
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Quote:
Originally Posted by 1998TJI6
Thanks for the info.

I have a Haynes manual and it says if you loosen the bolts and drain it out you should remove the cover and clean it. Has anyone loosen the bolt to drain and just tightened the bolts back up without cleaning?
If you crack the seal you need to take the cover off and reseal or you'll have a leak. The Permatex Ultra Black RTV is the best. You'll need to clean your cover and diff of the old gasket material. This is a good time to inspect the inside of your diff for chipped teeth, etc. Some folks even spray the inside down with brake cleaner (just wear eye protection).
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Unread 01-21-2008, 08:56 AM   #12
GreenJip
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Quote:
Originally Posted by 1998TJI6
Thanks for the info.

I have a Haynes manual and it says if you loosen the bolts and drain it out you should remove the cover and clean it. Has anyone loosen the bolt to drain and just tightened the bolts back up without cleaning?
I always take the cover all the way off to inspect the gears. If the cover only has sealant as a gasket, then you will have to clean it off and put new gasket sealant on it. I put blue RTV on the cover and then put the gasket on that. Now when I take it off, the gasket stays in takt on the cover and I just reuse it. I havn't had any leaks and I am on my 4th diff change this way.
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Unread 01-21-2008, 09:08 AM   #13
1998TJI6
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Quote:
Originally Posted by Dravintoad
You need to clean the surface and apply a new bead of RTV to that puppy.
Thanks, The Manual also says you can siphon it out, and then just refill. Has anyone been able to siphon the oil out?
It may be faster to remove the cover and clean it. It's been so cold I was looking for a short cut.
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Unread 01-21-2008, 09:12 AM   #14
Slithering_Joe
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What I do is remove the diff cover, inspect and clean. I use black or gray RTV because I don't want to see it. Use a gasket, put the right amount of RTV on the cover surface and the differential surface. Not so much that a ton squeezes into the differential housing. Let the RTV skin up. This skinning process allows air to react with the RTV so that it can cure. It also creates a little resistance between the two surfaces allowing a good tension for a seal. After everything is bolted up, I let everything set up for about an hour before I fill it with oil. Grab a beer. This gives the RTV a head start to cure without the gear oil getting involved. This may be overkill but I have never had a leak occur doing it this way.
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Unread 01-21-2008, 09:16 AM   #15
Slithering_Joe
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Quote:
Originally Posted by 1998TJI6
Thanks, The Manual also says you can siphon it out, and then just refill. Has anyone been able to siphon the oil out?
It may be faster to remove the cover and clean it. It's been so cold I was looking for a short cut.
I had to do it this way once. The rear cover on the Jeep was stuck. For the life of me I could not get the cover off without fear of destroying the cover. Everything was closed and I had to be somewhere the next day and "Murphy was in town." I didn't want to chance anything. I have a hand pump, looks like a huge syringe, that you can draw out the oil. Better than nothing. Syphoning works but it is extremely slow and a PIA - not effective especially when it is cold.
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