2012 GT 8.8 Gear Whine 2500mi...

[NickSezz]

Ever since the day I picked up my 2012 I noticed the gears whined in the 55-65mph range. I disregarded the noise since all of my rears have made some kind of noise given the right conditions but never failed on me.

Lately, I noticed the noise is now louder and noticeable with the windows up or down from 35-80mph. If I am driving next to a median, the whirling noise literally bounces off the wall and drives me up a wall! It is just annoying me now. I chose my exhaust set-up so there would be no drone and quiet while cruising. NOW ALL I HEAR ARE THE DAMN GEARS! LOL I am concerned about the noise this time because it is changing as the miles roll on and the vent is spitting out a good bit of fluid.

The good news is...I took it to the dealer (mods and all) and the tech agreed there is a problem and they ordered me a new set of 3.31's. The car should have its new gears by Tuesday.

Do you think this will solve the problem? I though factory set-up gears were hard to beat! The service person said this is not a usual write-up for this car. Anyone else experience anything like this?

 

[302]

Yea, it will. My local dealer told me about it first, I been looking out for the whine ever since. I'll get 3:73s out of them for free... That's what you should have done.

 

[Morris]

I had my 3.73s changed by the dealer at about 2500 miles. Still makes a little noise but its much better now.

 

[NickSezz]

Cool. The dealer told me I would have to buy the gears unless I stayed with the 3.31s. I don't mind them on this car though. I will keep ya posted..

 

[Seer]

Cool. The dealer told me I would have to buy the gears unless I stayed with the 3.31s. I don't mind them on this car though. I will keep ya posted..

Tousley sells the gears for $126.

 

[NickSezz]

Dropped the car off Monday night to be done Tuesday. Got a call Tuesday morning saying that the tech didn't like the gears that came in and is ordering another set and they have to keep the car over night. OK....

Got the car back just now (Wed) and....

Gear whine is still there. It is exactly the same if not worse...

They did not add any engine oil like I requested.

They ran out of time and did not realign my front wheels (requested because car is lowered)

So...I'm not happy. They will find that out tomorrow.

Parts list said they ordered gears, oil, and silicon. No bearings? WTF?? What else could be making the noise??

 

[BAKnBLK2010]

There have been quite a few people with bad pinion bearings from the factory. I'd say if they didn't put a new pinion bearing in that could be the problem. I really can't imagine a dealer pressing your old bearing off and installing it on the new pinion gear though. Kind of odd....

 

[NickSezz]

They said that they replaced everything so I will trust them on that. When I throw the car in neutral while coasting and rev the engine to a certain RPM I can get it to make the whining noise. So there is probably some gear whine and it is being amplified by a certain frequency from my exhaust setup...weird.

 

[D98GT]

I had issues with pinion bearings with my 2011 car when it had low miles on it

http://www.s197forum.com/forum/showthread.php?t=44441&page=3

 

[19COBRA93]

We've rebuilt several '11's and '12's. Fairly common. As for bearings, for a warranty claim they should have replaced at least the pinion bearings. They should be billed on your RO. It shouldn't make any noise. Keep bugging them about it. If they can't get it right, you might end up with a whole new rearend being replaced.

The only thing you should be concerned with, is if you get a Ford rep involved your mods will then be an issue. So keep on them, but try to stay out of the radar as well.

 

[Mach2burnout]

Make sure that your exhaust is not touching any part of your rear axle. If you can make it whine by revving the engine while coasting it could very well be transfer instead of an actual axle/gear problem. I've had some issues with this in the past. Exhaust has to be hanging free and not touching anything.