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Old 01-05-2015, 09:38 PM   #1
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Differential leakage ?

Installed my x pipe today. And saw this. Does it look bad? Please help

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Old 01-05-2015, 11:05 PM   #2
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In a perfect world, it would be completely dry...

No. It doesn't look that bad in the pictures. Can you see any gear oil dripping from the bottom of the diff? How about where the drive shaft connects to the yoke on the differential? Can you see any signs of oil leaking from there?
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Old 01-05-2015, 11:41 PM   #3
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Differential leakage ?

Nope no dripping but today I saw some dried up oil right under for the first time on the ground. I'll get a better tomorrow. If it is bad is it a way repair as in DIY or take it somewhere?


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Old 01-06-2015, 12:12 AM   #4
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It depends where it is leaking from.
If it isn't regularly leaving fresh oil spots on the ground, then it isn't a big deal. Just keep an eye on it and check the oil level when you get a chance.
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Old 01-06-2015, 07:09 AM   #5
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How can I check the oil level for that lol sorry for the noob question


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Old 01-06-2015, 07:29 AM   #6
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open the filler plug, located toward the top, facing the front of the car. upoper right when facing it. stick your pinky in. if you feel oil, your probably good. if not, stil something narrow in there and see if it hit oil. if not, then when your done panicking, unbolt the cover, drain it, add black rtv around it and replace the cover, then refill it with 3 quarts of 75w-140 gear oil (make sure it has the limited slip (friction modifier) additive, or add a small bottle of friction modifier with your gear oil. spray some degreaser where its dirty and just keep an eye on it for future leaks.
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Old 01-06-2015, 07:34 AM   #7
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How can I check the oil level for that lol sorry for the noob question


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You cant check the differential oil level bro, kinda like a closed can full of oil with a small superficial hole if its leaking , then change the differential seal. You should change your differential oil every 30 - 50 thousand miles , you dont want a differential leak to bad then it could get very bad , because you dont want the gears coexisting with metal on metal then your rear end is going to go out. Always use 80 to 90 weight oil for your differential oil heavier weight because of the abuse and stress the gears inside the rearend go through daily, its a differential drain bolt take it out drain the oil and refill it.
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Old 01-06-2015, 08:39 AM   #8
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Differential leakage ?

I will check when I get home. So if it leaking it's the seal?


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Old 01-06-2015, 10:21 AM   #9
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its an 8.8 axle, right? 99 to 04, ford calls for 75w-140 i believe. its the 20 dollar bottles of mobil 1. of course, a few other brands make em too.
He's right, best course of action is to drain it and fill it. You dont have a drain plug, so draining involves unbolting the cover and letting it all out. the factory "Seal" is just Black RTV. comes in a tube. just reapply a new one and fill it from the fill plug I mentioned before. Clean the cover off of course on the inside before you apply the silicone (rtv).
the 7.5 inch base model v6 axle calls for 80w90. the 8.8 GT rear axle calls for 75w-140.

And a leak like that looks like the seal is compromised. Nothing too uncommon about it. Its regular maintenance.
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Old 01-06-2015, 02:23 PM   #10
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Ok thanks appreciate the help. How much should labor cost for this?


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Old 01-06-2015, 02:58 PM   #11
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Try to locate the source of the leak before you drain the diff. If it is leaking from the pinion seal, you will likely need to have a shop do the repair. It never hurts to replace the gear oil but it will be a waste of time and money if the pinion seal is leaking and needs to be replaced.
Check the front of the differential, where the drive shaft is attached, and see if there is any signs of oil leakage.
If it is dry then your differential cover is probably the cause and you can do a drain and refill and get the cover sealed up properly.
Also, it is a good idea to check the differential vent that is located on the axle tube. They can become clogged and pressure will build up inside of the differential and that can cause leaks as well.
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Old 01-06-2015, 03:30 PM   #12
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Ill just add this here too because I have fallen for this. Make sure its the diff. The diff is pretty much the lowest/ farthest back part for oil to catch on. So if you are going 70 down the highway and theres a drop of oil more than likely it'll hit the diff and make it look like its leaking. So id get spray it down with some degreaser and watch if for the next couple of days to see if any gear oil shows up


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Old 01-06-2015, 09:31 PM   #13
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How long before it's severe? I've noticed a few drops of oil today right under the rear


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Old 01-06-2015, 09:38 PM   #14
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How long before it's severe? I've noticed a few drops of oil today right under the rear


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Depends really on how much has been lost over time and honestly this is the easiest fix in the world your robbing your self if you take this to a shop. American muscle sells a diff cover on their website for like 29$ and 2 quarts of fluid is like 8$ I think it's 75w140 fluid for it. So less then 50 and a very simple socket set and a razor to clean off the old gasket and presto chango it's fixed.


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Old 01-06-2015, 09:40 PM   #15
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It's there any DIY out there for this?


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Old 01-06-2015, 09:54 PM   #16
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Search YouTube on how to replace a diff cover on fords or any car really. They're all about the same just take a socket to the 12 bolts. Take them all out and use a screw driver to lightly pry it open and drain it. Then use a razor to clean off the old rubber gasket that's left on the axle housing to make a good seal when you put the new diff cover on. Then tighten it all back on and fill it from the front through the drain plug.


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Old 01-06-2015, 09:56 PM   #17
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http://mustangforums.com/forum/4-6l-...ial-fluid.html

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---------- Post added at 08:56 PM ---------- Previous post was at 08:56 PM ----------

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Old 01-06-2015, 09:59 PM   #18
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Thanks man I would try but I don't have lift


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Old 01-06-2015, 10:02 PM   #19
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Thanks man I would try but I don't have lift


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Jack and some jack stands? If not if your car isn't lowered its some what easy to get to if its stock height


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Old 01-06-2015, 10:08 PM   #20
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I have nothing lol but no it's lowered


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Old 01-06-2015, 10:12 PM   #21
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Should still be able to get under there


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Old 01-06-2015, 10:13 PM   #22
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Consider getting jackstands or ramps

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Old 01-06-2015, 11:43 PM   #23
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Will do. Still have to get it looked at.


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Old 01-07-2015, 09:32 AM   #24
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Time to put gears in!

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Old 01-07-2015, 10:08 AM   #25
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Differential leakage ?

Seems like it's the front


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Old 01-07-2015, 10:12 AM   #26
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Old 01-07-2015, 12:22 PM   #27
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Also, before removing the diff cover and all of that, check the bolts securing the cover to the diff.

I had a couple of those loose And fluid was leaking between those bolts. After a two-minute job tightening all of the bolts, I fixed the problem.


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Old 01-07-2015, 12:46 PM   #28
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Seems like it's the front


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It does look pretty wet underneath the yoke.
When you have your next oil change done, tell the shop to top off your differential, and then just monitor it for leaks, until the next oil change to see how much it is leaking. They usually leak pretty slow so you have some time to figure out how you want to go about repairing it.
As mentioned earlier, the perfect time to do a gear swap is while you are having the seal replaced.
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Old 01-07-2015, 02:43 PM   #29
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I really just want to get it done with but yea now I want gears lol. So how can I just fill it up


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Old 01-08-2015, 01:06 AM   #30
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Diffs aren't supposed to look like that? lol. Ive never owned a rwd car that didn't have that exact same oil spot. Never had a diff problem either lol. Maybe I just got lucky
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Old 01-08-2015, 04:18 AM   #31
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I really just want to get it done with but yea now I want gears lol. So how can I just fill it up


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If you wanna just fill it up, then just raise the car so that its all level (front and rear) and just add 75w140 in the fill hole until it begins to leak out. Its really supposed to be a tad under the hole so maybe raise the rear slightly more than the front. That should keep you lubricated until you get the leak fixed.
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Old 01-08-2015, 05:03 PM   #32
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I went to a shop. It's the pinion seal leaking. Was quoted at $100 parts and labor. Fair price?


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Old 01-08-2015, 05:19 PM   #33
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The part is cheap. And it shouldnt take a full hour, but it seems like an expected price. Expecially if they top the fluid, but if they do, they may only fill it with 80w90. Walmart sells supertech 75w140 for cheap, you may wanna be prepared to have that ready for them to use.

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Old 01-08-2015, 05:22 PM   #34
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Differential leakage ?

Yea he told me he would supply the oil and the seal

Also why is everyone suggesting gears?

Is that something can be done for that same price. I've never looked into gears

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Old 01-08-2015, 05:38 PM   #35
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Yea he told me he would supply the oil and the seal

Also why is everyone suggesting gears?

Is that something can be done for that same price. I've never looked into gears

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Well when you do gears you have to replace the seal and the oil anyways. If you were to ever do gears might as well do it while it is cracked open.

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