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  1. 01-22-2009, 12:27 PM #1
    vin_bom
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    Lightbulb '08 2WD - Harsh Downshifts

    Anyone having an issue with harsh downshifts when slowing at low speeds? I have a 2008 2WD Crew Cab w/LMG 5.3L V8 & 4 spd. trans. At times it seems like it gets stuck in 2nd gear at a stop and then shifts to 1st when you let off the brake. It's hard to describe! Anyone have a similar issue? Can you help me describe it to the dealer?
    Vince
    Metro Detroit, MI

    2008 Silverado Crew Cab LT 2WD
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  2. 01-22-2009, 12:31 PM #2
    tlperry68
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    Haven't heard of it but do tou have the tow button on? This sounds like an issue the dealer will have to fix for you. Espically if you are starting off from a stop in second gear.
    Trevor - Huntington Beach, CA
    2007 GMC 2500 4X4
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  3. 01-22-2009, 08:31 PM #3
    plowxman
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    i will have to say i have and that problem with my truck, seems like something in the rearend i believe, not sure but it does get annoying and im afraid my trucks gna break or something ha
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  4. 01-23-2009, 12:37 PM #4
    04sierracrewcab
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    I would take it to the dealer for sure!!!

    I would have them look at it, is it under warranty.?
    Ryan

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  5. 02-12-2009, 03:46 PM #5
    vin_bom
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    I found a tech bulletin on this issue (I work for GM).
    #PIP4020G: Groan, Clunk or Bump Noise from Launch or at Stop.
    They recommend dealers to lube the driveshaft slip yoke splines. This is a temporary repair and still under investigation.
    Vince
    Metro Detroit, MI

    2008 Silverado Crew Cab LT 2WD
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  6. 02-12-2009, 04:13 PM #6
    tlperry68
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    Good to know, what modles are they talking about?
    Trevor - Huntington Beach, CA
    2007 GMC 2500 4X4
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  7. 02-17-2009, 12:12 PM #7
    vin_bom
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    The service bulletin was issued for all 2007-2009 Silverado/Sierra.
    Vince
    Metro Detroit, MI

    2008 Silverado Crew Cab LT 2WD
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