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Noise from under TA

This is a discussion on Noise from under TA within the General Help forums, part of the LSx Technical Help Section category; Suddenly I'm getting a noise from under the car that sounds like as if it has snow tires. You can ...

  1. #1
    Junior Member Blue2KTA's Avatar
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    Blue
    2000 Trans Am

    Noise from under TA

    Suddenly I'm getting a noise from under the car that sounds like as if it has snow tires. You can hear it best at 20mph. Here is what i tried so far but the noise is still present:
    * While driving i put the car in neutral.
    * Turn the ignition off while driving.
    * Drove on grass (tire noise).
    * Checked fluid in rear.
    I took a video under the car with it jacked up while i spin the tire (both sides sound the same). Like i said it sounds like snow tires.

    [ame]http://www.youtube.com/watch?v=8jPMvHpKrX8[/ame]

  2. #2
    Impounded x-40oz-x's Avatar
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    It's kinda hard to tell from the video but check the wheel bearings.

  3. #3
    Smiles for 9.5 Years cammed goat's Avatar
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    Have you had brake work done recently? Sounds like your backing plate is rubbing against the brake rotor. Also, have you noticed any leaks in the rearend(pinion seal, axle seal)? Do you feel any vibrations while driving?

  4. #4
    Impounded x-40oz-x's Avatar
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    Quote Originally Posted by cammed goat View Post
    Have you had brake work done recently? Sounds like your backing plate is rubbing against the brake rotor.
    Haha i thought that also but i'll assume if that was the problem he'd notice it.

    What's the mileage on the car?

  5. #5
    Junior Member Blue2KTA's Avatar
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    2000 Trans Am

    I had both axles replaced in May of 07 and axle bearings in April of 09. I changed the rear pads about 1 year ago. No leaks or vibration. I just hear that low tone sound like snow tires. I don't hear that high pitch scraping sound that's in the video while driving. Has 57k miles.

  6. #6
    Smiles for 9.5 Years cammed goat's Avatar
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    OK. From your "snow tire" description, I would say the noise is a "whirring" sound, which usually means bearings.

  7. #7
    Junior Member Blue2KTA's Avatar
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    Quote Originally Posted by cammed goat View Post
    OK. From your "snow tire" description, I would say the noise is a "whirring" sound, which usually means bearings.
    Wheel bearings ? Whats involved in replacing them ?

  8. #8
    Impounded x-40oz-x's Avatar
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    Quote Originally Posted by Blue2KTA View Post
    Wheel bearings ? Whats involved in replacing them ?
    New bearings, a rag, and bearing grease. The hardest part is taking the tire off.

  9. #9
    Smiles for 9.5 Years cammed goat's Avatar
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    You will need to jack up the rear, drain the gear oil, remove the rear wheels, rotors, calipers and remove the c-clips in the pumpkin to be able to slide the rear axles out. I may be missing steps, but other members will chime in to help you out. If necessary, PM moderator Cutlass.

  10. #10
    Electrical Engineer KMdef9's Avatar
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    Quote Originally Posted by cammed goat View Post
    You will need to jack up the rear, drain the gear oil, remove the rear wheels, rotors, calipers and remove the c-clips in the pumpkin to be able to slide the rear axles out. I may be missing steps, but other members will chime in to help you out. If necessary, PM moderator Cutlass.
    Isn't there a pin to pop out? Usually held in by a bolt, then you push the shaft inwards and you can get to the c clamps then and pull the shaft right out?

  11. #11
    Smiles for 9.5 Years cammed goat's Avatar
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    Quote Originally Posted by KMdef9 View Post
    Isn't there a pin to pop out? Usually held in by a bolt, then you push the shaft inwards and you can get to the c clamps then and pull the shaft right out?
    I think you're right. Like I posted, there are steps I have missed.

  12. #12
    Electrical Engineer KMdef9's Avatar
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    Quote Originally Posted by cammed goat View Post
    I think you're right. Like I posted, there are steps I have missed.
    I'm not sure either. But makes sense, c clamps hold them from coming out and something needs to keep them from going in.

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    Senior Member Z28Thunder's Avatar
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    Quote Originally Posted by KMdef9 View Post
    I'm not sure either. But makes sense, c clamps hold them from coming out and something needs to keep them from going in.
    Yes there is a pin that holds the c clamps in...

  14. #14
    ArtistFormerlyKnownAsMac Silver Streak's Avatar
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    Does the sound actually come from the wheel areas.. or could it be coming from the pumpkin itself? When you pop the cover... look for chewed gears/metal shavings on the magnet.
    -Geno
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    Sold the other four f-bodies

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    Moderator Cutlass's Avatar
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    Quote Originally Posted by cammed goat View Post
    You will need to jack up the rear, drain the gear oil, remove the rear wheels, rotors, calipers and remove the c-clips in the pumpkin to be able to slide the rear axles out. I may be missing steps, but other members will chime in to help you out. If necessary, PM moderator Cutlass.
    Yep thats pretty good. Hardest part of a rear bearing repair is slide hammering out the old ones (most people don't have that tool) and pounding in the new bearing (most people don't have the proper driver/installer).
    Also, if the rear wheel bearing is bad, there's a chance you'll have a messed up axle shaft and you'd have to replace that also.

  16. #16
    Junior Member Blue2KTA's Avatar
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    Thanks for the info everyone. Since this is my daily driver and i'm off from work tomorrow i will bring it to the dealer. I can't tackle this one. Warranty expired last year so its time to pay I'll post back tomorrow..

  17. #17
    Moderator Cutlass's Avatar
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    If they recommend an axle shaft replacement and you don't like the price of a new one, you can ask them to locate a used axle from a salvage yard if possible.

  18. #18
    Senior Member JayTA98's Avatar
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    My rear end used to make this grinding noise. I had bad axle shaft. I put a new bearing in and it stopped the vibration but the noise was still there. After a while the bearing went bad again and I decided to use a repair bearing until I can find a good used axle. I replaced the other side bearing and inspected the axle. It was fine. This is how my bad axle looks like. I put the repair bearing and my rear end is quiet. Don't forget to put new gear oil and LSD additive in it.



    I used the bearings and seals from timken. Good so far.
    Last edited by JayTA98; 01-16-2011 at 08:09 PM.

  19. #19
    Junior Member need4fun2469's Avatar
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    if you have a 4 ch you will need to remove the sensors out of the backing plates to allow you to push the axles in far enough to release the c-clips.

  20. #20
    Junior Member Blue2KTA's Avatar
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    Went to the dealer today and was told the carrier bearings and pinion bearing are bad. They are covering it under warranty because its been less than 10k miles since they last worked on it. I guess i got lucky on this one just hope they install it right..

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