differential leak and black lug nuts - Ford Mustang Forum
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post #1 of 16 (permalink) Old 04-14-2017 Thread Starter
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differential leak and black lug nuts

My car is a 2014 mustang GT

I took my car to ford for a oil change, they said they found differential leak but they wanted 100 bucks just to figure out why it's leaking.

Before I spend this 100 bucks, is it a cheap fix? Or am I better off taking it to some where else?

My car is about 50k miles on her, I don't want to take it somewhere else and they make it worse then it is.

Also I bought some 19" black glossy wheels. They were off from a 2016 mustang GT.

Can I use 2016 black lug nuts? Or do I have to get 2014 black lug nuts? I don't have the 2016 black lug nuts, but since these are a 2016 black wheels, might as well right?

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post #2 of 16 (permalink) Old 04-14-2017 Thread Starter
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Also when I took my car in, I don't think they check the air filter. It looks really dirty. How long do they last? I have OEM filer.

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post #3 of 16 (permalink) Old 04-14-2017
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It's probably a bad pinion seal which is a $10 part. It's going to take a few hours to swap out though, so the shop will charge accordingly for labor. While they're in there it would be good to replace the pinion bearing at the same time so you don't have to touch the rear end again for a while.

At 50k miles you should be looking at swapping out the transmission fluid, fuel filter, air filter, cabin air filter, and spark plugs. If you drive hard maintenance becomes even more important. And as far as I know you will need to use the stock lugs. The 2016 lugs have a different thread pitch.

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post #4 of 16 (permalink) Old 04-14-2017
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Unless you've got over 60,000 miles on the car the rear end leak should be covered under the 5 year, 60,000 mile drive train warranty. As for how often to change the engine air filter, a lot has to do with the conditions the you drive in. In any case there is a maximum limit to how long you should go between changes. I don't have my owners manual in front of me, but I think it's supposed to be changed at least every 20,000 miles. Personally I never push the limits on any of the routine service items.
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post #5 of 16 (permalink) Old 04-14-2017
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Where is the leak coming from? If it's a pinion seal then- unless you have a little more than basic mechanical skills- let the shop replace it. Leaks from the axle seals are a little more doable with basic skills but probably best left to a shop if you're not comfortable with it. An axle vent problem or cover gasket leak could be done at home.

Biggest question is where the leak is located.

If the air filter is dirty then replace it. 3 minute job.
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post #6 of 16 (permalink) Old 04-14-2017 Thread Starter
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Just Under 50k, I usually take it to a family own ford, but I needed a a oil change bad. So I took it to one of ford own stores.

But I'll take it in a few week back to the family own ford see what they say about the warranty .

Tomorrow I'll get a new oem air filter and cabin filter.

Or napa filers any good?

Also it's been about 10-12k miles on the filter. Yeah it looks a dirty. Time for a new one.

Also my car is automatic, but I thought I read here trans fluid and rear end oil last for about 100k miles? Same for the spark plugs?

Are the spark plugs easy to get to in this engine? I can at least do that.

i would do my oil too, but 40-45 bucks at the dealership why even do it?!?! Lol
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post #7 of 16 (permalink) Old 04-15-2017
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Quote:
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Just Under 50k, I usually take it to a family own ford, but I needed a a oil change bad. So I took it to one of ford own stores.



But I'll take it in a few week back to the family own ford see what they say about the warranty .



Tomorrow I'll get a new oem air filter and cabin filter.



Or napa filers any good?



Also it's been about 10-12k miles on the filter. Yeah it looks a dirty. Time for a new one.



Also my car is automatic, but I thought I read here trans fluid and rear end oil last for about 100k miles? Same for the spark plugs?



Are the spark plugs easy to get to in this engine? I can at least do that.



i would do my oil too, but 40-45 bucks at the dealership why even do it?!?! Lol

Any Ford store has to honor warranty repairs.


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post #8 of 16 (permalink) Old 04-15-2017
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You need 2014-2005 lug nuts for your 2014 car.

The 2015+ cars have different threads on the wheel studs, so 2015+ lug nuts will not work on a 2014- car.


Also I'm pretty sure the 2015+ cars have different Tire Pressure Monitor System sensors inside the wheels, that won't work with 2014- systems. To get rid of the TPMS warning on the dash you will need compatible sensors installed inside the wheels.

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post #9 of 16 (permalink) Old 04-15-2017
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Quote:
Originally Posted by Aztec View Post
My car is a 2014 mustang GT

I took my car to ford for a oil change, they said they found differential leak but they wanted 100 bucks just to figure out why it's leaking.

Before I spend this 100 bucks, is it a cheap fix? Or am I better off taking it to some where else?

My car is about 50k miles on her, I don't want to take it somewhere else and they make it worse then it is.

Also I bought some 19" black glossy wheels. They were off from a 2016 mustang GT.

Can I use 2016 black lug nuts? Or do I have to get 2014 black lug nuts? I don't have the 2016 black lug nuts, but since these are a 2016 black wheels, might as well right?
For my pinion seal replacement it was $243.00 out of warranty at 175k last year at the dealer.

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post #10 of 16 (permalink) Old 04-15-2017 Thread Starter
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Quote:
Originally Posted by JBert View Post
You need 2014-2005 lug nuts for your 2014 car.

The 2015+ cars have different threads on the wheel studs, so 2015+ lug nuts will not work on a 2014- car.


Also I'm pretty sure the 2015+ cars have different Tire Pressure Monitor System sensors inside the wheels, that won't work with 2014- systems. To get rid of the TPMS warning on the dash you will need compatible sensors installed inside the wheels.
Yeah that what I read. Don't know if I should just take the ones out from my old rims or buy new ones.

I think the oem ones are about 200 bucks on eBay.

Any other that are cheaper online?
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Quote:
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. . . I think the oem ones are about 200 bucks on eBay.

Any other that are cheaper online?
$200? wow!

American Muscle will sell you a set for about $25. The finish on these is not super durable, buy two sets for $50 and you can swap them out when they start looking crappy.

Black Mustang Acorn Lug Nuts (79-14 All) - Free Shipping

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post #12 of 16 (permalink) Old 04-17-2017 Thread Starter
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Quote:
Originally Posted by JBert View Post
$200? wow!

American Muscle will sell you a set for about $25. The finish on these is not super durable, buy two sets for $50 and you can swap them out when they start looking crappy.

Black Mustang Acorn Lug Nuts (79-14 All) - Free Shipping
Not the lug nuts, but the TPMS are 200 without the controller. And 250 with the controller
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piece of painters tape to cover tpms light = free.

+1 on hopefully wtty repair on leak. If not sometimes they will waive diagnosis fee if they repair it but lthat needs to be discussed before. I would look to see if you can see where it is leaking from...vent is common/easy fix.

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Quote:
Originally Posted by Aztec View Post
Not the lug nuts, but the TPMS are 200 without the controller. And 250 with the controller
oops, sorry my bad! LOL . . . I think there are some better deals out there but not sure if they really work!

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Aztec,

The 'leak' may just be gear oil burping out of the vent. This is a very common issue and installing a 'turkey baster' (the rubber bulb) or a separate mini tank stops the problem. When I changed the vent valve for a turkey baster vent, there was a fair gush of air that came out. Which reminds me of another cause of oil leaks at the back: if the vent is plugged then the air pressure will push oil out of the axle seals (and other places).

HTH,

Chris


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