Thread: Terrible acceleration vibration with lowering springs

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  1. #1 Terrible acceleration vibration with lowering springs 
    GTX Level Member real diehl's Avatar
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    I put on my lowering springs today and everything went pretty smoothly. I replaced the front strut mounts and bearing plates, got zzp pogo washers, and cut the front bumpstops. Unfortunately I'm pretty sure this has nothing to do with my problems.

    I had heard of people having acceleration vibration w/ lowering springs but this is TERRIBLE. It feels like my tires are squares...

    The springs are Springtech, and they lowered it approximately 1.75" in the front and probably an inch in the rear. I already tried shorter dog bones and it seemed like it did nothing.

    I'm all out of ideas or where to go from here. I know the "vinny" spacers would help...but I have a hard time believing it should be THIS bad.
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  2. #2 Re: Terrible acceleration vibration with lowering springs 
    DUI BABY Bio248's Avatar
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    honestly it is pretty bad. hows the condition of your axles?
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  3. #3 Re: Terrible acceleration vibration with lowering springs 
    GTX Level Member real diehl's Avatar
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    Quote Originally Posted by Bio248 View Post
    honestly it is pretty bad. hows the condition of your axles?
    They seemed to be in good shape when I had it all apart. They haven't had a boot break or anything.
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  4. #4 Re: Terrible acceleration vibration with lowering springs 
    DUI BABY Bio248's Avatar
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    does it do it all the time, just between certain speeds, etc?

    mine did it mostly between 20-50 mph when on it hard, then it pretty much alleviated itself after that.
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  5. #5 Re: Terrible acceleration vibration with lowering springs 
    GTX Level Member real diehl's Avatar
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    Quote Originally Posted by Bio248 View Post
    does it do it all the time, just between certain speeds, etc?

    mine did it mostly between 20-50 mph when on it hard, then it pretty much alleviated itself after that.
    I actually had it jacked back up and my dad noticed the inside joint on the passenger side halfshaft has a decent amount of play in it. I'll replace it now and see if it helps.

    And to answer your question, it actually did it all the time. Even accelerating like a grandma had vibration...the harder I got on it, the worse it was.

    Hopefully this halfshaft will make driving it bearable before I go back to school.

    Going down the road at speed didn't show any problems really. The car rides and handles great...just this vibration issue that's bothering me.
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  6. #6 Re: Terrible acceleration vibration with lowering springs 
    GTX Level Member 03GTPLE's Avatar
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    let us know what happens after you swap out the axle
    2003 White Grand Prix GTP Limited Edition
    - 3.4 pulley, tune by Boostd1/CLINT@AIR, Short Ram Intake, PLOG, 3" ZZP Downpipe, AL 104's, 180* t-stat, Impala STB & 12" cross drilled/slotted/zinc washed rotors, DDM HID's, and put in a heads up display for now...
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  7. #7 Re: Terrible acceleration vibration with lowering springs 
    GTX Level Member real diehl's Avatar
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    GOOD NEWS!

    It's fixed and nearly all if not every bit of vibration is gone... That halfshaft was ****ed. Thank god.
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  8. #8 Re: Terrible acceleration vibration with lowering springs 
    GTX Level Member 03GTPLE's Avatar
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    good to hear!
    2003 White Grand Prix GTP Limited Edition
    - 3.4 pulley, tune by Boostd1/CLINT@AIR, Short Ram Intake, PLOG, 3" ZZP Downpipe, AL 104's, 180* t-stat, Impala STB & 12" cross drilled/slotted/zinc washed rotors, DDM HID's, and put in a heads up display for now...
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