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Clicking Noise

This is a discussion on Clicking Noise within the Drivetrain forums, part of the LSx Technical Help Section category; Just finished rebuilding the rear in my T/A. The Auburn broke so I replaced it with a Detroit TrueTrac and ...

  1. #1
    The Bandit Wesman's Avatar
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    Clicking Noise

    Just finished rebuilding the rear in my T/A. The Auburn broke so I replaced it with a Detroit TrueTrac and a set of used 3.42 gears.

    The problem is when the car is driven, at any speed above about 10MPH, there is an audible "clicking" sound that comes from the rear axle area. It is in time with the wheels, meaning for each wheel revolution one "click" can be heard. I pulled the rear back apart, double checked everything, and it all seems fine. The gears were bought used, so there are a couple of marks on the outside edge of the ring gear, but nothing major, and no marks on the contact area.

    For the techs, the rear is set to .006 backlash and 25 in/lbs preload on the pinion bearings. All bearings are new Timken bearings. I used a solid pinion spacer with shims to set pinion preload. Gear mesh pattern was good.

    After having this thing apart twice, I'm really stumped here. Any ideas would be helpful.
    1998 Trans Am WS6 SGM
    Lid, Pro 5.0, WS6 Short Stick, LS7 Clutch, TB Bypass, Detroit TrueTrac, Poly Mounts, Bilstein Shocks, LS6 Intake, SFCs, CTS-V Brake Upgrade, STB, Nitto 555's. SS Longtube Headers and True Duals w/ H pipe and Magnaflows. Tuned by Harris Speed Works. 341.4WHP/346.1 lb/ft.

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    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    Imho if everything internally specs out like you said I'd start looking @ the brakes or elsewhere.. just my .02 Prolly something simple..
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    The Bandit Wesman's Avatar
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    Quote Originally Posted by Smittro View Post
    Imho if everything internally specs out like you said I'd start looking @ the brakes or elsewhere.. just my .02 Prolly something simple..
    Yea thats my thought as well. I've double and triple checked almost everything. It also doesn't seem to do it in reverse.

    Only thing I can think of is its the used gears I got. Which really, really pisses me off.

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
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    Is it like this noise Ed had?
    Pulsating Noise

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    The Bandit Wesman's Avatar
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    Quote Originally Posted by Cutlass View Post
    Is it like this noise Ed had?
    Pulsating Noise
    Not quite...but similar. In the video, the noise has a sort of whine to it. Mine is a distinct click/clatter sound with each revolution of the wheels. Like a stick in a bicycle wheel.

    ABS sensor is definitely a possibility though, thanks for the suggestion. I'll have to check that out.

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    Moderator Cutlass's Avatar
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    Quote Originally Posted by Wesman View Post
    Mine is a distinct click/clatter sound with each revolution of the wheels. Like a stick in a bicycle wheel.
    That description really sounds like a brake backing plate that is a little tweaked and rubbing somewhere.

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    The Bandit Wesman's Avatar
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    Quote Originally Posted by Cutlass View Post
    That description really sounds like a brake backing plate that is a little tweaked and rubbing somewhere.
    I agree...but I don't have any backing plates

    However, my rear rotors are pretty beat and have a nasty lip on them on the rotor face as well as in the drum hat. Perhaps they are touching somewhere and rubbing, creating the noise. I'll check that as well.

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    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    I had the parking brakeshoe come off the ring before and was laying in the hat.. Maybe you lost one when you put the rotors back on..
    Last edited by Smittro; 10-12-2010 at 10:32 PM.

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    Moderator Cutlass's Avatar
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    Except he said he doesn't have backing plates so he must not have a parking brake?

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    Quote Originally Posted by Cutlass View Post
    Except he said he doesn't have backing plates so he must not have a parking brake?
    Good (?) But he mentioned the drum hat having wear so I assumed he had a p-brake... I'm not sure the backing plate is actually needed for the p-brake to funtion..

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    Moderator Cutlass's Avatar
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    Yeah I haven't look at one in a quite a while, but I was thinking the PB shoes and cable attaches to backing plate...I'm not sure though.

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    Quote Originally Posted by Cutlass View Post
    Yeah I haven't look at one in a quite a while, but I was thinking the PB shoes and cable attaches to backing plate...I'm not sure though.
    I'd have to look too. I have'nt changed brakes/rotors in 2+ years..

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    u-joint?

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    Before reading that was my first two thoughts...brakes or u-joint related.

    Does it sound like metal on metal or no? Could be the brake caliper hanging up or the brake clip rubbing on the housing.

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    The Bandit Wesman's Avatar
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    Quote Originally Posted by Cutlass View Post
    Except he said he doesn't have backing plates so he must not have a parking brake?
    Thats my error, sorry should have clarified.

    I have stock backing plates for the parking brake setup, but no backing plate for the rotors, as are all the 98-02 F-bodies. So basically I just meant that there were no backing plates behind the rotors to rub against them, just backing plates for the e-brake.

    My mistake

    Haven't had a chance to mess with it since I drove it the other nite, been busy fixing other people's cars!! Guess I'll have to put it on the lift again and see if I can pinpoint the noise.

  16. #16
    The Bandit Wesman's Avatar
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    Update:

    Ran the car on jackstands again. Sounds like a almost like a loose pinion bearing, and its more of a repeated clunking noise than a click.

    I also took a video, heres the noise:



    You can start to hear the noise about 10 seconds into the video, its loudest when I put the camera under the differential.

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    Member bberretta's Avatar
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    Sounds almost like mine did when I grenaded mine. When I would turn the tire it would take about a 1/8 of a turn before the driveshaft would engage. For me it was the Posi that was split in half and allowing play between the ring and pinion which led ot me breaking teeth off the ring and pinion.

    I hate to say it but I think it's most definately inside the rear. Pull the cover off and have a friend turn the rear tire until you hear something out of the ordinary.
    2000 Pontiac Firehawk #0041 of 742

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    The Bandit Wesman's Avatar
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    Quote Originally Posted by bberretta View Post
    Sounds almost like mine did when I grenaded mine. When I would turn the tire it would take about a 1/8 of a turn before the driveshaft would engage. For me it was the Posi that was split in half and allowing play between the ring and pinion which led ot me breaking teeth off the ring and pinion.

    I hate to say it but I think it's most definately inside the rear. Pull the cover off and have a friend turn the rear tire until you hear something out of the ordinary.
    I agree, it does sound internal to the differential.

    I've had it apart twice already. Everything looks, feels, and checks out normal. Backlash is good, pinion preload is good (unless the nut somehow backed off and lost preload) and side bearing preload is tight. Mesh pattern checks out, and the diff is practically brand new, its a Detroit TrueTrac.

    When I turn the wheels or driveshaft by hand, its dead quiet, no bad noises or excessive lash/play at all.

    I appreciate the feedback.

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    Member bberretta's Avatar
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    How does the u-joint feel?

    I doubt the pinion nut is backing off, but I've seen stranger! From the video it sounds like its coming from the front- pinion bearing/yoke/u-joint. When you put a load on it, how does it behave?

  20. #20
    The Bandit Wesman's Avatar
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    Quote Originally Posted by bberretta View Post
    How does the u-joint feel?

    I doubt the pinion nut is backing off, but I've seen stranger! From the video it sounds like its coming from the front- pinion bearing/yoke/u-joint. When you put a load on it, how does it behave?
    I agree, it was hard to tell by ear but on the camera it sounds like the noise is concentrated by the pinion. U-joint was good last I checked, but who knows. Looks like its time to put it on the lift again and re-check the u-joint and pinion bearings. Its really starting to piss me off!!

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