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Noisy rear ?

This is a discussion on Noisy rear ? within the Drivetrain forums, part of the LSx Technical Help Section category; I just picked up a stock 98Z this week and today I noticed when its cold I get a groaning/squeeking ...

  1. #1
    12 SECOND CLUB FASTEDDIE Z's Avatar
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    1998 Z28 12.53@107.8

    Noisy rear ?

    I just picked up a stock 98Z this week and today I noticed when its cold I get a groaning/squeeking noise from the rear on low speed turns and it feels like its binding slightly .Is this possibly a limited slip noise ? No clanking or banging .Sounds like an old house window sticking Any idea what it is ?? Thanks

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    Senior Member bills98ta's Avatar
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    1998 Trans Am

    Might be a tight u-joint on the drive shaft...

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    Member fergyflyer's Avatar
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    I have the same noise. Does it more when it's damp out.

    I think it might be the parking brake dragging, but I'm not sure.

    Any help on this????

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    I've heard of Torsens making "a rusty screw noise" and GM recommends the LSD additive to cure it.

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    Member pewterz55's Avatar
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    light pewter metallic
    1999 z28

    subscribe. let me know if u get this figured out please!!!

  6. #6
    Member fergyflyer's Avatar
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    I had my gear lube changed at 59,000. I might have heard noise once or twice. At 61,000 I changed the brakes. Then within 500 miles I started hearing the noise. It's definately a rusty screw sound and it happens when you turn towards the right.

    I changed gear lube at 65,000 making sure that friction modifyer was added. It wasn't the GM brand but it said that it was for GM rear ends. I also pulled the rear brakes and adjusted the parking brake. Also I sanded the surface of the parking brake shoe. The noise stopped for about 2500 miles.

    At 70,000 I changed to Royal Purple and didn't use any additive. It said the additive was not required. I made a mistake and played with the brakes again so I can't pinpoint why the noise stopped.

    At 72,500 The noise came back with a vengance. Right turns only. Forward or reverse. If I put my foot on the brakes the noise gets less or goes away.

    The foot on the brake thing leads me to the brakes. The changing of the gear lube and it stops leads towards the additive.

    Guess I need to add the GM stuff and see what happens. I could probably squirt an ounce or two in without changing the lube again.

    Rusty screw is exactly the sounds though.

    Thanks all for your help!

  7. #7
    12 SECOND CLUB FASTEDDIE Z's Avatar
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    All Fixed !!! Did my 373's ,used 75W90 gear oil and GM L/S additive . sounds great now . No more shaking or binding on turns . Now I need a tune

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