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Old 09-20-2010, 09:14 PM   #1
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Differential leak.

My jeep has just started to leak fluid out of the rear differential, and I talked to a friend and he said it was a seal or something that needed to be replaced. Three questions: how big of an issue is this, what's my timeframe for getting it taken care of, and what do you think a price would be for this?

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Old 09-20-2010, 09:18 PM   #2
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My Jeep is leaking fluid out of the front diff. It has the same problem with a seal that needs replaced. I got a quote from a local mechanic and it needs to be fixed to pass inspection. I'll try to find how much he charges to fix it if you give me a bit. I guess it depends on how much it's leaking as to how big of an issue it is. I don't know too much about it. Maybe someone knowledgeable can chime it?

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Old 09-20-2010, 09:25 PM   #3
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If the diff is leaking from the cover then all you need is RTV sealant. They don't use a gasket. If the leak is at the pinion seal where the driveshaft enters the diff then it's best done by a qualified mechanic.

But that's just my personal pinion. Hahaha

Wolf


Copied from another thread. Depends on where exactly the leak is.
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Old 09-20-2010, 09:26 PM   #4
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Quote:
Originally Posted by InvertChaos
My Jeep is leaking fluid out of the front diff. It has the same problem with a seal that needs replaced. I got a quote from a local mechanic and it needs to be fixed to pass inspection. I'll try to find how much he charges to fix it if you give me a bit. I guess it depends on how much it's leaking as to how big of an issue it is. I don't know too much about it. Maybe someone knowledgeable can chime it?
Yeah that'd be nice. I'm really starting to regret my purchase I have no money I'm a college student and I've already had to fork over too much for a flipping water pump and I have nothing to even make a payment on it. Ugh. Lamentations of a poor student.
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Old 09-20-2010, 09:34 PM   #5
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I'm still in high school so my rents are paying for it to pass inspection at least lol so that's kinda nice. The gas mileage is killer though. Yeah I'll dig it up. It might be tomorrow when I post how much it's going to be to fix it.
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Old 09-20-2010, 09:38 PM   #6
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Yea, take a look at where the fluid is leaking out. If it's around the seal (where the differential cover meets the differential) then it's literally put down some newspaper and a bucket underneath. Slowly remove the surrounding bolts. The cover may be stuck, so simply just pry it off with a screw driver. Clean in and around the inside (I'm not exactly sure what fluid to use but I used brake cleaner). Wipe off the magnet. Then put a spread of RTV Sealant around and rebolt to the specified torq. Search for differential fluid replacement wrangler on google and you should get some good results.

If it is the pinion seal, then yes that's a little bit (but not a whole lot) of work left to be done by a weekend warrior with some friends or a professional. Even so, post it in your local forums and you might get a few guys willing to help out.

Now, for that water pump - please tell me you did it yourself and are only complaining over $50? It's at most a 2.5 hour job and requires just moving some components around and replacing the water pump then reassembly! Stop by and ask questions first! You'll save mucho dinero in the long run.
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Old 09-21-2010, 05:07 AM   #7
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You have to be a do it your selfer. This forum is exactly what you need to become that. I have found that usually the job is smaller and easier than you anticipate before going into it. I remember when the injection pump went out on my Chevy Diesel truck and the dealer quoted between $2000 and $3000, you know when they were done it was going to be closer to $3000 than $2000. A friend of mine said "do it yourself" so I did. The rebuilt pump cost me $1000 and about 7 or 8 hours of my weekend time. I make pretty good money but I can't make $2000 in 7 or 8 hours unless I land a really good sidejob and they don't come along very often.
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Old 09-21-2010, 10:01 AM   #8
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Post up a pic.. Afaik, they all leak, at least everyone I've ever looked at has some seepage. If it's not dripping on the ground I wouldn't worry about it... Have a look at some others, I bet they all seep... It's especially noticeable when the diff has a nice mud film on it, that just never seems to come off after wheeling.
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Old 09-21-2010, 10:33 AM   #9
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Exactly where is the axle leaking from? The front of it where it connects to the driveshaft? On the side next to the wheel? Or from the rear differential cover?
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Old 09-21-2010, 10:44 AM   #10
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Yeah dont stress yet, answer the questions posted above and pics would be even better. but if it's just coming out of the edge of the diff cover all you need is some rtv. get something for the fluid to drain into, pop the cover off, scrape old rtv off, wipe dry, add new rtv, replace cover, let sit, add new diff fluid. A little more to it but not much, just want to get across how easy it COULD be for you. good luck
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Old 09-21-2010, 12:14 PM   #11
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Quote:
Originally Posted by Jerry Bransford
Exactly where is the axle leaking from? The front of it where it connects to the driveshaft? On the side next to the wheel? Or from the rear differential cover?
It's the rear differential cover and so far I've only seen one drip on my driveway. When should I change it out?
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Old 09-21-2010, 12:22 PM   #12
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Quote:
Originally Posted by elijah.caine

It's the rear differential cover and so far I've only seen one drip on my driveway. When should I change it out?
Just go to an auto parts store buy some fluid and a drain pain and do both differential...
Then presto bingo... Problem solved as the others have posted before... If it's where the drive shaft connects, disconnect the driveshaft and drop the axle then replace thst rubber grommet.
Good luck
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Old 09-21-2010, 12:28 PM   #13
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What fluid do I use? I've never done anything with differentials.
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Old 09-21-2010, 12:34 PM   #14
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Quote:
Originally Posted by elijah.caine
What fluid do I use? I've never done anything with differentials.
Just go to auto zone and ask them, just provide your vehicle info.
Im trying to remember what fluid I use.
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Old 09-21-2010, 12:42 PM   #15
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Wish i could help I have some in the garage left over but not there.....sorry. But all I did is what walkingstick suggested, went to AZ and asked them, easy as that. the only thing that would complcate it is if you had a SYE in when you do the rear then you need to add something to your fluid there, i think at least.
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Old 09-21-2010, 12:43 PM   #16
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I use 75wt gear lube
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Old 09-21-2010, 12:57 PM   #17
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Quote:
Originally Posted by Ibuildembig
I use 75wt gear lube
Brand?
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Old 09-21-2010, 12:58 PM   #18
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Quote:
Originally Posted by elijah.caine View Post
What fluid do I use? I've never done anything with differentials.
The important thing is that whatever gear lube you select for your axles, it must have the GL-5 rating. Though most any gear lube you'll find on the store shelves will be GL-5 so it's not hard to find. The exact viscosity is not all that important, there isn't a whole lot of difference in gear lube viscosities like there is with engine oils because the two types of lubes are measured on two different viscosity scales.

For heavy uses like tough wheeling, towing a trailer, etc., stick with a heavier viscosity like 80W-120, 85W-140, 90W-120, etc. For lighter duty use and especially if it gets cold where you live, a 70W-80, 75W-90, etc. is fine.

Personally, I prefer a non-synthetic gear lube for my heavier-use axles but with light duty use, either synthetic or non-synthetic is fine.
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Old 09-21-2010, 12:58 PM   #19
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90 percent of the time I buy the Oreillys brand....the other 10 percent I buy Valvoline.
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Old 09-21-2010, 06:57 PM   #20
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Glad this question poped up-have a front diff that has seepage(3 weeks new to me)
haven't worked on vehicles in more yrs than i care to think about(befor you needed a PHD in mech/ele engineering to open the hood)
Have to ask-RTV, is that a brand name or what it is-if it's what it is-any brand names(advanced auto across the street from me)
Poped a plug-out of gap-will change those also-wires, cap rotor looked ok but want to get the diff done b4 winter-might as well do both just for grins/giggles. So far love my jeep-whole lotta more fun than the 2500hd-too bad it can't pull the travel trailer
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Old 09-21-2010, 07:15 PM   #21
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RTV is a silicone-based sealant made by a number of companies, most notably Permatex who has pretty well cornered the market on RTV. RTV stands for Room Temperature Vulcanization.

It comes in tubes that hang on the racks in automotive stores and it is used for sealing things like differential covers etc. Ultra-Black RTV from Permatex is a good all-around RTV that I use for pretty much everything that needs to seal oil or gear lube in. It's a great choice for differential covers.
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Old 09-22-2010, 12:04 AM   #22
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ummm....yeah, what Jerry said.

I've never had to mess w/ a wrangler diff but every s-10 I ever owned had diff seals go bad by 80k, and both Cherokee classics I had went bad ~100k. Not one of them was more than an hour's worth of labor.

look, if you are going to own an out of warranty vehicle and you're on a budget, the best thing you can do for yourself is buy a Haynes or similar book. I went from barely able to change oil to replacing clutch slave cylinders, head gaskets, carbs, most anything that doesn't require machining. You're only limited by access to tools and/or friends to help. And seeing as how you're in college, there's got to be a club or something where jeepers and/or gearheads congregate and Will Work For Beer!


UPDATE:
guess I'll put my money where my mouth is...just found my weekend project. small leak in the front diff
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Old 09-22-2010, 11:20 AM   #23
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I use the Ultra Copper, its heat resistant
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Old 09-22-2010, 08:08 PM   #24
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Quote:
Originally Posted by Jerry Bransford
Exactly where is the axle leaking from? The front of it where it connects to the driveshaft? On the side next to the wheel? Or from the rear differential cover?
I just noticed this today on the wheel. It leaked definitely from the differential cover but what does this mean?
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