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2000 CHEVY SUBURBAN 5.3 LITER 4 WHEEL DRIVE not shifting

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      jgg765
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      2000 CHEVY SUBURBAN 5.3 LITER 4 WHEEL DRIVE.
      AUTOMATIC TRANSMISSION THAT IS NOT SHIFTING PROPERLY
      IT WILL NOT NOT GO INTO 3RD AND FOURTH GEER MOST TIMES WHEN IT DOES GO INTO THIRD AND FOURTH GEER AND YOU GIVE IT GAS IT GOES BACK INTO SECOND GEER AGAIN. THIS IS A CONSISTENT PROBLEM. SO I CANNOT GO FASTER THAN 30 MILES IF YOU TRY AND GO FASTER THAN 30MILES KEEPS JUMPING DOWN TO 30 MILES. THERE WERE SOME PCODES BUT NEVER CHECKED ANY FURTHER THAN THAT. TRANMISSION FLUID IS FULL. IT WAS WORKING FINE ONE DAY AND STOPPED.
      HAS ANYONE ELSE HAD THIS PROBLEM AND SOLUTION

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