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  #13  
Old 07-13-2012, 07:41 PM
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Re: Grinding Noise... low differential fluid?

You could use the standard jack, but you should get some stands for the safety, never thrust a jack alone when going under the jeep. You could jack up one side, put a stand under it and jack the other side and put a stand. There is a V sign on the beam where you should put the jack. If you donīt have stands, you could use thick wooden blocks, but remember to always do it in a safe way. ( looks as if sex lessons)
Never use water inside a diff, you could use some rags to get most of the fluid out. I never use any solvent or alike, just let it drain and remove all fluid with rags or towels.
The "special" 247 T-case fluid is Mobil 424, but just hidden in a MOPAR disguish. Iīm using the Mobil 424 for around 3 years now, no issues. Originally the 247 T-case was filled with +4 ATF, but this fluid was causing clutch shatter and they changed to the Mobil 424. No additives in here.
It can be that there are some writeups on these tasks, but they are really that simple that in fact not much can go wrong. Its just that simple as we had discribed before.
For the RTV, just make a nice 3 mm bead all around and donīt forget to keep it on the inner side of the bolt holes, otherwise it can leak through those holes. (so no RTV in the hole itself, but just pass around it on the inner side)
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  #14  
Old 07-14-2012, 12:10 AM
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Re: Grinding Noise... low differential fluid?

OK guys, thanks for all the info. I'm going to start on this... just confirm my plan here to make sure I'm not doing anything wrong....

--Transfer Case: I'm gonna remove fill plug, then the drain plug, let drain. Fill with 2 quarts of Mobil 424. Where can I buy this? I can't seem to find it anywhere online....

--Diff: Start in Front, with no Jack. Loosen Diff bolts, let drain. Remove cover. Clean out oil with rag. Use black RTV to seal cover. Put back on and screw on bolts. Fill with: http://www.amazon.com/Royal-Purple-0...ywords=75w-140 until over flows. Repeat in rear, but jack back end up with jack stands on either side of rear. Repeat process.

Last few questions:

1. Do the Diffs have drain plugs, or basically just loosen the bolts and it will start to drain? I assume they have fill plugs correct? Do I need to get a fluid pump to be able to get the oil into it, or is there room to get the bottle up there and pour it in?

2. When I put jacks on the rear of the vehicle, can i jack it up and just put stands on each side of the rear? So essentially just the back will be lifted up, and the front will be on the tires? Where do I put the jacks at on either side?

3. As I said before, where can I get the Mobil 424 fluid? I assume order somewhere online? can't seem to find it anywhere...

I think that's it. Sorry if I sound like an amateur, I guess I am! Just want to make sure I don't mess anything up. And I don't usually work on my car when it is lifted on jacks, so I don't want to screw that up and have it fall on me!
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Old 07-14-2012, 04:43 AM
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Re: Grinding Noise... low differential fluid?

For the T-case fluid, just buy it from the stealer if you canīt find the Mobil 424. Its only 2 qts, so should not break the bank.
Diffs have no drain plugs. Just loosen upper covers bolts a few turns and remove the lower bolts. Sometimes it already starts leaking, but if not, pry the cover with a knife or screwdriver. For the rear diff, when you have the DANA-44a aluminum diff housing, take care not to scratch the housing.
The front diff has a metal fill plug with build-in magnet. Use a 1/2" breaker bar or 1/2" ratchet to loosen it. Rear DANA-44a has a rubber plug, just remove it with a screwdriver. Fill diffs and T-case until they overflow, with the jeep on level ground. So for the rear diff, fill it with the wheels on the ground and not on the jack.
I use a funnel with half meter hose to fill diffs. The funnel i keep just outside of the right wheelwell. Use a big enough funnel and hose, otherwise it takes a longtime for the thick fluid to flow.
Only rear has to be jacked, front stays on ground. Donīt remember well if you really have to jack both sides. Try it with one side first and see if you have space to remove the upper cover bolts. The is a mark on the beam under the jeep where a jack should be placed, its a triangle.
For the T-case have a look first which size of allen wrench you need, before you start. To fill the T-case, i use a small type of handpump on a can, takes some time, but a funnel doesnīt work there.
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Old 07-14-2012, 07:17 PM
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Re: Grinding Noise... low differential fluid?

OK guys, just got back from auto parts store and I have EVERYTHING ready to go. Going to tackle this tomorrow. Last questions, I promise:

1. I keep reading things that say I need to add the LS additive in the diffs. I got Mobil 1 75w140 synthetic. You guys are saying I DONT need to add anything else, right? Just the Mobil 1?

2. The fill plug on the differential looks positioned kinda low... I assumed it would be on the top of the unit. Does the differential not fill completely, only like half way up (to the fill plug). I just want to make sure I'm not actually looking at a drain plug....

3. Do you guys know what size and type wrenches I need for the fill/drain plugs on the Transfer Case, and Fill plug on the Differentials? I just want to make sure I have everything before starting.

4. I don't have a torque wrech. Am I going to be OK tightening the diffs by hand as tight as possible?
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Old 07-16-2012, 09:03 AM
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Re: Grinding Noise... low differential fluid?

tighten them tight, but don't over tighten them and snap heads off lol that wouldn't be good. I dont use a torque wrench for this job, just go by how it feels. I cant remember the socket size for the diff bolts, but i'm pretty sure its a 10mm hex for the tcase plugs.
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Old 07-16-2012, 01:23 PM
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Re: Grinding Noise... low differential fluid?

I got it done! thanks guys for all your help!!
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Old 07-16-2012, 02:10 PM
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Re: Grinding Noise... low differential fluid?

Good to hear! did the noise go away?
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Old 07-16-2012, 08:20 PM
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Re: Grinding Noise... low differential fluid?

Quote:
Originally Posted by 01grand View Post
Good to hear! did the noise go away?
Unfortunately no, the noises remain... I started another thread to get some help with them. I think maybe I need to add some more FM. Apparently wasn't enough in the Mobil 1 synthetic I used..
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