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My 1999 Chevrolet Tahoe won't change gears. It will run fast speed, but won't change a gear.

Answers from the Automotive Experts

Brandy Schaffels, Editor at, Inc. You don't mention your mileage, but considering the age of your vehicle, it might be time to replace your transmission. First be sure you have the correct amount of transmission fluid, here is a link to a video to help you with that: If that doesn't help things, please find an AskPatty Certified Repair Shop at and they can help you diagnose and repair the problem.

Maryann Croce, Owner at Croce’s Transmission Specialists Hi Annette For your 99 Chevy Tahoe, if the vehicle will not change gears, this could be a transmission related problem. The vehicle should be scanned for any codes. If the vehicle is not shifting correctly it can be caused by an electrical, mechanical or hydraulic problem. By getting it diagnosed this will determine what kind of failure it is and you will know what kind of repair options you may have. Thanks If you need assistance finding a local technician, please find an AskPatty Certified Repair Shop at and they can help you diagnose and repair the problem.

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