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  1. Chevy Silverado Forum (GMC Sierra)
    I have an 07 Sierra classic and the 4wd is not working. I press the auto 4wd, 4wd hi, or 4wd low and the light just flashes. I can hear the transfer case trying to engage. I have verified the ground connection under the driver and have replaced the dash switch. I do get a "Service 4wd" on...
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