1999 GMC Other

Transmission problem
1999 Other GMC Models 6 cyl Four Wheel Drive Automatic 159000 miles

parked on hill and release the emergency brakes and heard something pop. Nowmy truck will not go into reverse adn when I drive, the car will let me drive but when I try to go over 50 miles per hour, will no switch gear to pickup speed.
July 26, 2010.

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