Thread: '08 GXP Trans Shudders When Stopping

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  1. #1 '08 GXP Trans Shudders When Stopping 
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    Any ideas of the cause for my trans to shudder when stopping? At about 10 mph with each stop, the car shudders as though the trans isn't shifting down. If I select neutral before stopping, all is smooth.

    The previous owner put synthetic ATF in it. Fluid is clean, clear, and smells new.

    I'm tempted to try Lucas Trans Additive, but thought I'd run this past those of you on the GP forum first.

    Thanks.
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  2. #2 Re: '08 GXP Trans Shudders When Stopping 
    GTP Level Member LeadfootCJ7's Avatar
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    What type of Synthetic ATF?
    2007 Grand Prix GXP;2002 Camaro Z28 - tune, CAI, and exhaust
    2006 GMC 2500HD - ATS high flow manifolds and uppipes, turbo back exhaust, blocked EGR, Denali headlights, Reflexxion Cown Hood
    1994 Olds Cutlass Supreme 2 door
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  3. #3 Re: '08 GXP Trans Shudders When Stopping 
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    I don't know--the previous owner put it in. He works at a Mobil Gas Station so it's probably Mobil I Synthetic ATF.
    Last edited by bocoogto; 10-18-2017 at 08:38 PM.
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  4. #4 Re: '08 GXP Trans Shudders When Stopping 
    GT Level Member Gregorius's Avatar
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    I bet a new PCS <pressure control solenoid> in the trans would fix it. Did you have scanned for stored Transmission codes?

    PCS is a $20 part, but it's under the side cover of the trans, and requires a partial cradle drop, and pulling the axle out.

    No additive is going to fix it, if the pcs is wonky.
    Dude! Full Service Manuals! 2004-'08 User manuals, full docs wiring diagrams trouble codes... go look.
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