Is this a rear gear whine?

Discussion in '2011+ Ford Mustang V6 3.7L Tech' started by cdenigris, Dec 29, 2020.

  1. cdenigris

    cdenigris Junior Member

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    Hey guys, I'm trying to figure out if this is a gear whine sound. Watch this video I made and let me know what you think.

    YouTube video
     
  2. Rich

    Rich Member

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    It's the gears. A howl or whine during acceleration over a small or large speed range is usually caused by worn ring and pinion gears or improper gear set up. They were not installed properly and now they have "worn in" to the pattern. You cannot fix this, the ring and pinion have to be replaced and you will need to verify that the following are within spec of the gears you choose:
    Pinion bearing preload
    Pinion depth
    Backlash
    Wear pattern using gear marking compound

    If it whines as soon as you accelerate and gets louder as you go faster, then it's a bad pinion bearing. I would not keep driving on a bad pinion bearing because it can seize and tear up the drivetrain.

    You can still drive with it as long as the noise doesn't bother you (if it's not the pinion bearing), but in the video it sounds like they weren't installed correctly and after so many miles od driving they have "worn in" improperly.
     
  3. Midlife Crises

    Midlife Crises Member

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    Before I got too excited I’d check to make sure the pinion nut is tight. It is not uncommon for then to loosen.
     
  4. gbstang

    gbstang Member

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    I don't think its a gear whine, it would always be present though the whine would be faint and increase at speed. since it came on at 45 I would think it is the transmission.

    Rest your hand on the T-handle and see if you feel it in the shifter when you hit 45..
     
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