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Thread: Vibration at 55 to 65 mph

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    Default Vibration at 55 to 65 mph

    Ok I am new to this site and this may have been already posted, but I have to ask. I am getting tire vibration between 55 and 65 mph. The car has the summer only 19" Bridgestones. I saw something on this the other day and now I cant find it. Was there a TSB out on it? Thanks.

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    Addicted Member johnh's Avatar
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    Not sure if there's a TSB, but many people have had to get wheels rebalanced. They had to do mine three times to get it right...
    2009 G8 GT Stryker Blue Prem/Sport/Roof
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    Resident Giant bigtreepu's Avatar
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    sure it isn't the AFM?

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    Junior Member liquidred's Avatar
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    i get the same thing man i have the 19s too and its the AFM unless yours is different

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    Beyond Help gearhead455's Avatar
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    Afm?

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    No Name, No Slogan SLA's Avatar
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    Active Fuel Managment aka DoD Displacement on Demand
    Mods: ARH 1-3/4" LT w/catted x-pipe, SLP Powerflo Axleback, Vararam intake, VMS ECM/TCM Tune

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    Default No not the AFM

    No it's not the AFM, even putting the car in neutral doesnt make it any better. Even the rear view mirror vibrates. But thanks for the input.

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    Water spots R my enemy!!! JerzeyGT's Avatar
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    I had the same thing happen with my 18" all season tires... after several road balance attempts... I now have four new tires that were replaced at 3k miles
    2009 G8GT MGM Red/Onyx Interior SHOW 20% Tint Front and Back 8000K Low Beams - 3000K Fogs - Tinted Taillights/Side Marker/Corner Lenses V6 Radiator Cover Onyx/Red Pontiac Shifter Knob /GXP Rear Diffuser Third Shift Studios Atari Gauge Cover GO Vararam Intake/93 Octane Vararam Cortex Tune/Vector HSRK/SLP Powerflo Axleback

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    Check this out....this is what I had, and it is WONDERFULLY smooth now, once the driveshaft was indexed and carrier bearing re-centered. I just logged into the GM Service Information and copied/pasted the TSB.


    #PIC4989: Drive Line Boom Noise And/Or Vibration - (Oct 2, 2008)


    Subject: Drive Line Boom Noise and/or Vibration



    Models: 2008-2009 Pontiac G8


    There may be a either a boom noise or vibration and in some cases both a noise & vibration detected in a very few 2008 & 2009 G8's. This condition may be detected by customers at speeds of 55-65 MPH on either 08 or 09 G8's. The noise could be described as a low frequency boom or moan noise (not a whine) coming through the body. The vibration is generally felt in the seat or the floor pan. The condition could be caused by either a misaligned center support bearing assembly or the prop shaft mounting to the differential yoke.

    Recommendation/Instructions:
    The prop shaft center support mount is slotted left to right and can be adjusted by loosening the bolts which are accessible through holes in the metal shield between the prop shaft & the floor sheet metal. After loosening the center support bolts you can use a pry bar between the prop shaft & floor to adjust the center support. If the alignment isn't correct the prop shaft will usually "snap over" into proper location with very little input.

    If the condition is both noise & vibration felt through the floor, re-indexing the prop shaft to the differential yoke may have to be performed:

    •Mark the relative alignment of the propshaft, rubber coupling, and differential in the original position.
    •Number the nut and bolt pairs and their hole in the rubber coupling which join the rubber coupling to the differential (silver) and the nut and bolts which join the propshaft to the rubber coupling (black).
    •Remove rubber coupling from differential and propshaft, ensure the nut and bolt pairs are kept together.
    •Re-assemble indexing the rubber coupling and silver bolts clockwise (relative to differential), and the propshaft and black bolts counter clockwise (relative to differential).
    Last edited by therapture; 02-19-2009 at 09:28 PM.

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    Quote Originally Posted by SLA View Post
    Active Fuel Managment aka DoD Displacement on Demand
    It's not that. Have your dealer do the bulletin fix. While mine was in, I also had the wheels checked/road force balanced, and at 70mph, it's like a totally different car! (the balancing was almost spot on, the bulletin was the real fix!)

    edit: I am the parts manager at our mid size dealership and check out bulletins/what not all the time.
    Last edited by therapture; 02-19-2009 at 09:27 PM.

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