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Old 11-16-2011, 08:58 PM   #1
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Changed Rear Diff

Do you need to put RTV around the rubber fill stop on the rear diff? Changed the fluid on my 97 TJ and it seems to have a very slow leak from the rubber fill stop. I didn't put any RTV around it and I may have overfilled it a little. I filled it until it slowly came out of the fill plug and then let it drain until it stopped. I have read you should really leave about 1/2" below the fill plug so I am wondering if this is normal and once it leaks enough to get below the fill plug it will stop. It doesn't even seem to be collecting at the bottom of the diff nor leaving any spots on the driveway but if I lift the bottom edge of the fill plug it will leak slightly, did this when I got home from work today just checking front and back since I did them this past weekend and everything was warm.

I also didn't read the directions on the RTV which said to only finger tighten the diff bolts and let it setup for an hour then tighten another 1/2 turn. I just tightened them down so do I have to redo this?

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Old 11-16-2011, 09:04 PM   #2
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Not sure on a d35 fill plug but don't think rtv is a bad idea. I use rtv for a gasket as well and just torque it down. I don't let it set up and have never had a problem.

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Old 11-17-2011, 05:44 AM   #3
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Just did mine last weekend. RTV around the gasket flange but not any on the fill plug. I haven't had any issues with it leaking. Also, there wasn't any RTV on the plug when I removed it, nor have I heard anything about using it there. Not sure why it is leaking, though. Maybe your current plug needs to be replaced? I think you can get one from online vendors without a problem, or perhaps a local scrap yard. Good luck!
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Old 11-17-2011, 08:10 AM   #4
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i did my rear 44 a couple weeks ago and didn't need to put any RTV on the drain plug. is it threaded into the cover enough?
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Old 11-17-2011, 08:10 AM   #5
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Quote:
Originally Posted by rjpark36 View Post
Just did mine last weekend. RTV around the gasket flange but not any on the fill plug. I haven't had any issues with it leaking. Also, there wasn't any RTV on the plug when I removed it, nor have I heard anything about using it there. Not sure why it is leaking, though. Maybe your current plug needs to be replaced? I think you can get one from online vendors without a problem, or perhaps a local scrap yard. Good luck!

Well there was RTV around it (PO did) but the plug seems to be fine, nice and firm/soft with no signs of wear. I am just going to keep an eye on it the next few days and see if it becomes more of an issue. Checked this morning on my drive into work and didn't see any signs of leaking.
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Old 11-17-2011, 08:46 AM   #6
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On this topic. To change the fluid, you just take off the entire cover and let it all spill out, right?
put on gasket/rtv bolt it back on. How long do you let it sit before filling? I need to change mine as I'm not sure when it was last done.... if ever.
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Old 11-17-2011, 09:07 AM   #7
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SinfulDragon: Check this out:

Jeep Axle Differential Fluid Change Service


When you pop the cover off, it will be obvious. All of the fluid will drain out, and you will be able to wipe out the differential, inspect for damage, and clean everything before sealing it back up. The link above should give you a good idea of what needs done.
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Old 11-17-2011, 09:13 AM   #8
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Quote:
Originally Posted by thetoadLJ View Post
i did my rear 44 a couple weeks ago and didn't need to put any RTV on the drain plug. is it threaded into the cover enough?
This plug doesn't have any threads...just a plastic/rubber plug you push in.
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Old 11-17-2011, 09:15 AM   #9
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If the plug is old, you may want to look at getting a new one. Even though it's still soft, it may have shrank for some reason. They should be cheap enough to pick one up and see if it makes a difference. For the record, I've never had to use RTV on any of the rubber fill plugs.

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