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Old 02-13-2014, 05:32 PM   #36
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So the rear end should be producing no noise at all? I can also hear my rear end, It's always between 45-60, its not loud but if I really pay attention to it I can hear it. I cant remember if my car did it since I got it. It's a 2013 GT with 3.31 and I'm the first owner.
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Old 02-13-2014, 09:54 PM   #37
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Thats probably tire noise your hearing

If it's not tire noise you need to see your dealer. To check it out the car needs to be jacked up in the rear on very sturdy jack stands. Engine on and go to harbor freight and pick up a very long screwdriver or better yet get the stethoscope and put one end to your ear and the other to the pumpkin. It's good to have a person in the car to give it a little gas in 2nd. gear. Run the rpm's up and let them down and you will know if the rear is making the noise you hear. It is very and I mean very rare for a factory differential to hummm.
Ford does have an additive to put in if it is the rear to quite it.
Ronnie
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Old 02-13-2014, 11:40 PM   #38
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Quote:
Originally Posted by ronnie948 View Post
If it's not tire noise you need to see your dealer. To check it out the car needs to be jacked up in the rear on very sturdy jack stands. Engine on and go to harbor freight and pick up a very long screwdriver or better yet get the stethoscope and put one end to your ear and the other to the pumpkin. It's good to have a person in the car to give it a little gas in 2nd. gear. Run the rpm's up and let them down and you will know if the rear is making the noise you hear. It is very and I mean very rare for a factory differential to hummm.
Ford does have an additive to put in if it is the rear to quite it.
Ronnie
Oh its definitely the rear end and not my tires. I mentioned it to the service guy that was working on my car due to some door rattle and he said some noise is normal that I shouldn't worry about it unless it starts to get louder. He said that usually when people mess with it the thing comes out sounding worse. He isn't the first person that has said that some gear whine is normal. My mach 1 had some gear whine as well and the mechanic I took it to also said it was normal, especially with mustangs.
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Old 02-14-2014, 07:34 AM   #39
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Something new to me.

Out of the four Mustang's I owned , Not any of them had a differential noise of any kind. Not even the 1965 271 HP I put the 4:56 gears in.
I have owned about thirty or forty cars in my life including full race cars and none of them ever had a noisy rear. Noisy Mufflers"YES" but no noise in the differential.
When I worked at a Ford dealer many years ago I do remember a customer I sold a car to had complained about a noise in his rear so they put some additive in the rear and it fixed the noise. That was a Fairlane 500 right out of the factory. ( May have been a Galaxy "CAN'T REMEMBER" ) I do know that Cookie, The guy that owned the speed shop I hung around did a lot of gear swaps and told people to not hot rod for at least 100 miles. He also drove the car he swapped gears on for at least twenty five easy miles before calling the car owner.
Ain't no way in hell a differential or any gear is supposed to make enough noise for you to hear it inside the car while driving down the road.
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Old 02-14-2014, 10:57 PM   #40
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Quote:
Originally Posted by ronnie948 View Post
Out of the four Mustang's I owned , Not any of them had a differential noise of any kind. Not even the 1965 271 HP I put the 4:56 gears in.
I have owned about thirty or forty cars in my life including full race cars and none of them ever had a noisy rear. Noisy Mufflers"YES" but no noise in the differential.
When I worked at a Ford dealer many years ago I do remember a customer I sold a car to had complained about a noise in his rear so they put some additive in the rear and it fixed the noise. That was a Fairlane 500 right out of the factory. ( May have been a Galaxy "CAN'T REMEMBER" ) I do know that Cookie, The guy that owned the speed shop I hung around did a lot of gear swaps and told people to not hot rod for at least 100 miles. He also drove the car he swapped gears on for at least twenty five easy miles before calling the car owner.
Ain't no way in hell a differential or any gear is supposed to make enough noise for you to hear it inside the car while driving down the road.
Ronnie
Guess it's time to complain about it again.
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Old 02-16-2014, 07:45 AM   #41
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Google rear end noise and you will see it happens but it ain't supposed to.

There is a difference between a gear sound which you will hear from your transmission if you take the sound deaden material out and drive with the transmission exposed. It it a slight very smooth sound. It is there but you won't hear it when every thing is in place. It is not the same with the rear differential. The only way you should ever hear it at all is with a stethoscope unless something is "WRONG" It is really frustrating when you pay and something like this happens and they blow you off.
It takes a whole lot of time, patience and skill to install a ring set in the rear. That is why a good shop will charge you more. A good shop will also do it over if there is a problem.
I sure hope they will resolve this noise problem for you.
Ronnie
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Airaid Cold Air intake. red caliper covers, 3.7L performance engine cover, Flat black hood spears.Boss 302 strut brace, CDC rear panel, Trunk Cargo net,--Dash carpet cover,
Viser stickers to cover ugly yellow warning crap,Aluminum driveshafft and Swarr Bar.
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Old 02-16-2014, 11:04 AM   #42
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Quote:
Originally Posted by ronnie948 View Post
There is a difference between a gear sound which you will hear from your transmission if you take the sound deaden material out and drive with the transmission exposed. It it a slight very smooth sound. It is there but you won't hear it when every thing is in place. It is not the same with the rear differential. The only way you should ever hear it at all is with a stethoscope unless something is "WRONG" It is really frustrating when you pay and something like this happens and they blow you off.
It takes a whole lot of time, patience and skill to install a ring set in the rear. That is why a good shop will charge you more. A good shop will also do it over if there is a problem.
I sure hope they will resolve this noise problem for you.
Ronnie
Yes my car makes that noise that you described to the op a couple posts up. It comes and goes when you get on or off the throttle and its there around certain speeds as well, It is very frustrating.. But thanks I'll go talk to them about it again and see what they do about it, if anything I'll mention the additive before they want to go in an open it up.
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Old 12-01-2014, 08:12 AM   #43
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Originally Posted by SouthFLV6 View Post
Just called up the shop that installed the gears and they said that it's normal to have harmonics with gears and a aluminum driveshaft
If it whines its not set up properly,,I have done a few at work mainly trucks with factory gears,,I set up some ford racing 373,,after about 10 tries I finally got it right..So if it whines,,its set up wrong..Ive heard some people say that some whine will go away,,but im not so lucky..
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Old 11-07-2015, 11:00 AM   #44
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i get that same issue on my 2011 mustang gt

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Originally Posted by SouthFLV6 View Post
I here a whining noise coming from my rear end, especially when I'm cruising at high way speeds. I've recently started hearing the noise at most a month ago and have no clue what it is.

My mods:
CAI
Full exhaust
3.73s, which were installed way before I heard the noise
One piece driveshaft
Lowered 1'5in
LCAs
Adjustable UCA
Adjustable pan hard bar
Bama tune

If anyone can help me out it would be much appreciated. Thanks.
where in south florida did u got to get the gears changed?????
that noise drives me nuts
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Old 11-07-2015, 11:29 AM   #45
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RECOMMMED SHOP

Where in south florida can u reccommend me to install a new gear set
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