TRUCK SHIFTS FROM FIRST GEAR TO THIRD GEAR WITHOUT GOING INTO SECOND GEAR. I HAVE TO SPEED UP TO 20MPH WHEN TAKING OFF, THEN LET UP ON THE GAS PEDAL FOR A SECOND OR TWO, AND TRANNY SHIFTS INTO THIRD GEAR. TROUBLE HAPPENED ON THE HIGHWAY. I WAS GOING TO ATLANTA, GA AND PULLED OFF THE INTERSTATE TO FILL UP THE GAS TANK. AS I LEFT, I NOTICED THE TRUCK WAS NOT SHIFTING INTO SECOND GEAR. WHEN I LET OFF THE PEDAL, I FELT IT GO INTO THIRD GEAR. I DON'T THINK I HAVE OVERDRIVE, EITHER, AS I CAN'T FEEL THE SHIFT. HAVE BEEN DRIVING IT LIKE THIS FOR 3 MONTHS. BUT I AM LEAKING SOME TRANS FLUID WHEN PARKED. I BELIEVE THE REAR SEAL NEEDS REPLACING. COULD THE SHIFT PROBLEM BE A BAD MODULATOR?
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