New Rear Gears, Whine

Discussion in 'Classic Mustang Specific Tech' started by 65FBE2, Jul 25, 2013.

  1. 65FBE2

    65FBE2 Member

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    I changed rear gears on my 8" to 3:25. All new everything in the carrier. Set up according to Ford manual. Back lash is good and bearing pre load set on side bearings and pinion with new crush sleeve. Pattern looked good. Now the rear whines on the drive side at 50 mph. Coast side is quiet. What is the fix for this?
     
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  2. rbohm

    Founding Member

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    it sounds to me like the gears are a bit loose even though they are in spec.
     
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  3. 69shocktower

    69shocktower Member

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    I had a drag shop build me a new 9" rear end and swap it into my 69 coupe. With new axles, tracklock and 3.51 gears. It whined for quite awhile at highway speeds. I think its a break in period thing.
     
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  4. madspeed

    madspeed Colonel Mustard
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    did theyuse the Ford fricion modifier added to the gear oil?
     
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