Chevrolet Repair: Trans, chevy silverado, shift fork

Question
First gear will not work in my 2000 chevy silverado 4.3L 4x4. All other gears seam to work and shifts smoothly

Answer
HI DANIEL,  IF YOU DO NOT HEAR ANY GRINDING NOISE OR WHIRLING SOUNDS THIS SOUNDS TO ME IS IF 1ST GEAR WALKED OFF THE MAIN SHAFT OR THE COLLAR BROKE. IF THE SHIFT FORK BROKE YOU COULD NOT GET IT INTO 3RD GEAR EITHER..DID YOU HEAR ANY STRANGE NOISE AT ALL BEFORE THIS HAPPENED ??? YOU WILL NEED TO REMOVE THE TRANS AND OPEN IT UP TO SEE WHAT IS GOING ON. SORRY FOR THE BAD NEWS..HOPE THIS HELPS YOU,,,TOM..