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  1. #1
    Member 79Firebird_99TA's Avatar
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    Black
    99 Trans Am

    Noise when accelerating hard off line (recently lowered)

    I have lowered it 1.25" with Strano springs/Bilstein combo. I installed LCA relocation brackets, but have not installed an adjustable panhard bar. It's fine if I take it easy. The noise was a clunking sound with the same frequency as the spinning driveshaft. I'm thinking u-joints and/or pinion angle ... and maybe the driveshaft is hitting something when the rear squats down during hard take off from a stop?

  2. #2
    024mula 024mula's Avatar
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    silver
    '02 Firebird Formula

    I'm no expert on this, but could it be your rear tires touching your fenders?

  3. #3
    None Shall Pass Knight's Avatar
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    99 WS.6 - Modified

    If you lowered the car, and do not have an adjustable torque arm, your pinion angle will be off. Couple that with hard acceleration, and I'm guessing your u-joints are binding. You will need an adjustable torque arm, and set the pinion angle around -2°.

  4. #4
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/ mods, 00 FBVert

    I'm with Walt on this....

  5. #5
    Member 79Firebird_99TA's Avatar
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    Black
    99 Trans Am

    Turns out the nut on the transmission mount was very loose. I do agree that I need a adjustable panhard bar..... ordering one today.

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