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Hey guys. I have an 03 GT with 3.73 gear and ford racing ring and pinion and bearings with 31 spline axels. When I’m driving in the highway in 5th gear and have traction control on I hear what sounds like a whine coming from the rear center. Traction control off I don’t hear it but I also haven’t had too much of a chance to notice it. The rear was JUST done less than a month ago and I’ve had no issues at all (even with this wine). I do 85mph at 2500rpm. Rides and shifts smooth. What could this noise be?
 

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Rear Gear wine is common with 3.73’s, however if you paid a shop for the install and the wine is really bad, take it back and make them address the issue.
 

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The most common cause of gear whine is how they were installed.
...............Agree with post # 2, take it back to whoever did the work..
 

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Shop screwed up. Take it back. Once they start whining like that you need new gears.
 
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