How to Silence Rear Axle Noise?

Discussion in '2005+ Ford Mustang v6 4.0L Tech' started by Chistopher, Aug 17, 2021.

  1. Daniel Roberson

    Daniel Roberson Member

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    Mine was so loud that I thought that people could hear it from a sidewalk. I eventually just had the gears changed again and bearings were replaced. I figure this will be the last time since I don't drive it often maybe two thousand miles a year. Still waiting for it to return from the supercharger installation. Things are really backed up at the mustang shop I go to.
     
  2. Bryce A

    Bryce A Junior Member

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    I have 3.55.
     
  3. Juice

    Juice forum member

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    Wheel bearings in rear do not change noise turning. The side loading is handled by the carrier bearings. So if you have noise one way and not the other, it is a carrier bearing that is going bad. Except if you installed Cclip eliminators.
     
  4. gbstang

    gbstang Member

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    That is not necessarily true.. You DO load your axle bearings in a turn.. The C-clips only keep the axle in the carrier from wandering (for better words) the bearing retainer keeps the axle in the car.. The load felt during turns will be the axle bearings themselves and not the carrier bearings.
     
  5. LarryJM

    LarryJM forum member

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    TIRES!!!
     
  6. Juice

    Juice forum member

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    Wheel bearings in c clip axles do NOT carry any side loading.
    All side loading is handled by the carrier bearings through the c clips.

    All the rears I have worked on, not many had a bad axle bearing. If you have a bad axle bearing, there is a real good chance the axle is also toast, as the axle is the inner race.
     
  7. Rick Simons

    Rick Simons Member

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    Generally speaking:
    A pinion bearing issue will change with load and sometimes speed.
    On these cars a wheel bearing will make more noise as speed increases, but won't necessarily change when cornering.
    A carrier bearing will get louder as speed increases, AND when cornering. Since the axle bearings are the floating type, lateral (cornering) loads are transferred to the carrier bearings via the thrust block between the spider gears.
    Another thing to check: does the axle housing get too hot to touch in operation?
     
  8. Lime1Gt

    Lime1Gt Junior Member

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    Tires. :thumb2:
     
  9. Chistopher

    Chistopher Junior Member

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    I don't know, I don't usually touch the axle housing during operation. :)

    I'm going on a bit of a longer drive tonight (1 hour) I'll give it a check. But the more that I look at it, the more I think it's just that the previous owner took out the factory noise deadening.
     
  10. DieHarder

    DieHarder Member

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  11. Chistopher

    Chistopher Junior Member

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    Sound deadener did next to nothing. I did the entirety of the rear seats and trunk. My dB meter read exactly the same at 10, 25, and 45
     
  12. Chistopher

    Chistopher Junior Member

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    Also, I've noticed the sound doesn't change when I change road surfaces.
     
  13. gbstang

    gbstang Member

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    Guess you just ruled out the tires then....
     
    crjackson2134 likes this.
  14. Maczs007

    Maczs007 Junior Member

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    Ever since I upgraded my rear lower control arms I have had a constant scraping noise that sounds like a small pebble stuck between the brake dust shield and the rotor but it isn't that. I think it is just normal rear end noise amplified?
     
  15. Maczs007

    Maczs007 Junior Member

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    Last edited: Aug 25, 2021
  16. Maczs007

    Maczs007 Junior Member

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  17. Edmon

    Edmon Junior Member

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    Could you help me here too please.
    Having the same humming/griding noice.
    But only when the car in decelerating!! At 30 or 60mph. Doesn't matter the speed.
    Is this a pinion gear going in and out ?
    No noice change when cornering.
    Thanks in advance
     
  18. Mach2burnout

    Mach2burnout 05 Redfire GT

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    Do you still have the back seat?
    Do you have aftermarket UCA or LCAs?
    Have your gears ever been changed or the gear lube changed?


    Sent from my iPhone using Tapatalk
     
  19. gbstang

    gbstang Member

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    Yup, sounds like gear noise for sure, especially if its only in decel.. If the backlash at the pinion/ring gear is incorrect it will definitely make noise either accelerating or decelerating.
     
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