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Thanks to everyone who gave their input. I was told that the reason for the vibration and sound is from installing (Ford Racing gears) two separate shops told me this. I was told they are known to be very noisy and have a vibration. Both sets that I have used were Ford Racing 4:10 and now 3:73. Im having a hard time believing that Ford Racing gears could be the reason. Has anyone ever heard of this?
No it's not the ford racing gears causing this. There is an off brand of aftermarket gears that DO have that issue though - Motive gears. The Ford gears are the best ones you can buy for an upgrade on a Ford.
What caused you to replace the Driveshaft two years ago? What did you replace it with OEM or aftermarket? I'd look at the driveshaft first. Take it to a driveline shop, preferably one that builds driveshaft. They'll have the proper equipment to check the trueness and balance of your existing driveshaft and U-joints.
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I was told that the reason for the vibration and sound is from installing (Ford Racing gears) two separate shops told me this. I was told they are known to be very noisy and have a vibration. Has anyone ever heard of this?
I had installed FRPP 4.10's into my 05 GT using the proper Ford design Pinion Depth shim gauge and never had one moment of trouble with that gear set. They were quiet but made far too much torque multiplication for the stock tire size. I changed them back to 3.55's after 1.5 years and they still look good as new. I should have bought 3.73's instead.
To the best of my knowledge Ford Racing gears require the proper gear set up tool as they take readings from the shim/bearing side of the pinion to the carrier bearing edge. Most after market gears I've seen have a flat machined surface on the end of the pinion they take their measurement from to the centerline of the carrier bearing. I don't think most shops have the Ford style pinion depth setting tool and just guess by reusing the old shim from the original gears in the vehicle.
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