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5.0L V8 Technical Discussions Any questions about the 'Coyote' engine, transmission, exhaust, tuners/CAI, or gearing can be asked here!

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Old 06-21-2012, 12:40 AM   #1
Slappy3243
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Question Rear-end whine with stock 3.73 gears...

Hey Guys,

I am new to Mustangs, but I picked up a beautiful new 2013 Premium GT a few weeks back. Of course, being performance-minded, I found a car with the 3.73 rear-end. I noticed today while driving on the highway there is a whine between about 63 mph and 70 mph. It's not deafening, but noticeable. It seems to only be under load when I am giving it some gas. Is this type of whine normal? Sometimes more aggressive gears can be a bit noisier. It only seems to happen during the speed I mentioned above. Let me know what you guys think. Thanks!
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Old 06-21-2012, 07:31 AM   #2
dominant1
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drain the rear end gear oil and add this:



it also works great in manual transmissions to!

http://www.amsoil.com/index.aspx
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Old 06-21-2012, 02:30 PM   #3
Slappy3243
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Quote:
Originally Posted by dominant1 View Post
drain the rear end gear oil and add this:



it also works great in manual transmissions to!

http://www.amsoil.com/index.aspx
Thanks. However, I know the dealer would void the warranty on the entire rear-end if they found out about this. Is this a common enough problem where there may have been a TSB posted on this by Ford? Thanks!
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Old 06-21-2012, 02:52 PM   #4
dominant1
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My 2010 had 3:73's never made a peep take it to the dealer. The only way oil can void a warranty is if it can be proved it caused the failure! Amsoil is much better then the oem oil!
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Old 06-21-2012, 03:00 PM   #5
Derf00
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OP if you are concerned about it, take it in to the dealer. Have them document it. Some gear whine might be ok during the first few hundred miles. If you have them document it NOW and it gets worse then they can document it getting worse (paper trail) and resolve it if needed.

I wouldn't mess with a problem with a brand new car. That's what a warranty is for.

If you go changing the OEM oil and the problem still exists or gets worse, they'll charge you for refilling it with OEM oil and then trying to diagnose the original complaint.
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if you are getting 29mpg in your 5.0, you aren't driving it correctly
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Old 06-21-2012, 05:02 PM   #6
Slappy3243
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Quote:
Originally Posted by Derf00 View Post
OP if you are concerned about it, take it in to the dealer. Have them document it. Some gear whine might be ok during the first few hundred miles. If you have them document it NOW and it gets worse then they can document it getting worse (paper trail) and resolve it if needed.

I wouldn't mess with a problem with a brand new car. That's what a warranty is for.

If you go changing the OEM oil and the problem still exists or gets worse, they'll charge you for refilling it with OEM oil and then trying to diagnose the original complaint.
I think I will do this. As part of the deal when I bought the car is that I am getting a brand new GT500 spoiler painted and installed. The owner of my car had a spoiler delete option. I will bring it up before they do the install and maybe a tech can take it for a ride or I can take a tech for a ride and show him. I do want it documented to play it safe. It is just weird that it does it only in that narrow MPH range. Thanks!
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Old 06-21-2012, 05:02 PM
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