Question about 1997 GMC Yukon

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I own a 1997 GMC Yukon 5.7 liter 4 wheel drive. This problem only happens in the summer when outside temp is above 60. Truck shifts very hard at 10 mph once it has been driven for at least a half hour. If I shut the truck off, even if for only 20 seconds, the truck will shift beautifully again for a while. The service engine light comes on every so often, but if the outside temp drops, say at night, it will eventually go out. I've had the transmission serviced, changed thermostat and had coolant flushed.

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  • LucasJOhn Aug 02, 2008

    I own an 1998 GMC Yukon with the same problem. Once it has warmed up driving for a while, starting from a stop it has a hard shift going from 1st to 2nd gear.

  • Welker Apr 22, 2009

    Same problem at about 80000 miles.
    Thought I was needing a new transmission.
    Put vehicle in GM dealership to have transmission serviced.
    Told by very knowledgeable mechanic to quit using OverDrive as the transmission cannot turn fast enough to properly cool. OD was added to meet Federal quidelines on fuel economy.
    Thats what you get when government designs automobiles.
    Quit using OD and now have 186000 miles on transmission.
    Forget and use OD especially in hot weather and problem returns.
    These 4WD heavy vehicles should not have an OD.
    In real life OD is useless, especially if you pull a boat or trailer.


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The electrical harness between the steering column in these gmc units are troublesome. I just paid $500 (part $300) to have mine changed out on my 97 gmc yukon, but for 335,000 kilometers, no leaks, no oil consumption, not bad

Posted on Aug 03, 2008

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