AN ACR CREW ATTEMPTED TO USE 1 DEG FLAPS FOR TKOF ON A B- 737-400.

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WX WAS NOT A FACTOR IN THIS FLT. I ELECTED A SINGLE ENG TAXI AND WE JOINED A LONG LINE OF ACFT PROCEEDING FOR TKOF. DURING TAXI; AT A TIME THAT I COULD NOT READILY CONFIRM IT; THE COPLT ANNOUNCED 'THIS WILL BE A 1 DEG FLAP TKOF' AND SET THE FLAP HANDLE AT THE SAME TIME. HEARING THIS STATEMENT CREATED A MINDSET THAT NEITHER OF US WAS ABLE TO OVERCOME WHILE ATTEMPTING TO RECONCILE THE CONFIGN HORN WE WOULD HEAR LATER. THE SECOND ENG WAS STARTED AND THE AFTER START AND BEFORE TKOF CHKLISTS WERE ACCOMPLISHED. IT IS MY HABIT TO RELEASE THE PARKING BRAKE AFTER BOTH FLAPS AND TRIM ARE SET FOR TKOF AND ADVANCE A THROTTLE TO ASSURE PROPER CONFIGN. WE RECEIVED THE TKOF WARNING HORN. I DIRECTED THE COPLT TO RUN THE ENTIRE TAXI CHKLIST; INCLUDING FLIPPING THROUGH THE ACARS WT AND BAL PAGES. UNFORTUNATELY; WE DID NOT PICK THE CORRECT INFO. I SELECTED FLAPS 5 AND THE CONFIGN HORN SILENCED. THE COPLT ASKED IF WE COULD TAKE OFF WITH FLAPS 5 AND MY REPLY WAS THAT THE CONFIGN HORN MUST BE RECONCILED PRIOR TO ATTEMPTING TKOF. I ELECTED TO PULL OUT OF THE LINE AND PROCEED BACK TO THE GATE. THE COPLT REVIEWED THE WT AND BAL AND DISCOVERED OUR OVERSIGHT. A MAINT REPRESENTATIVE ENTERED THE COCKPIT AT THE GATE AND WE INFORMED HIM THAT WE HAD DISCOVERED OUR OVERSIGHT. THERE ARE NO OBVIOUS CUES ON THE CAPT'S PANEL TO DISTINGUISH A 300 FROM A 400 SERIES ACFT. THE GROSS WT OF THE ACFT APPROXIMATED THAT OF A HEAVILY LOADED 300 SERIES ACFT. CONFIGN PROBS ON 400 SERIES ACFT DUE TO CLOSE STABILIZER TRIM TOLERANCES ARE A COMMON OCCURRENCE SO HEARING THE CONFIGN HORN IS NOT UNUSUAL. PREVENTION OF RECURRENCE: MAKE NO PRONOUNCEMENTS PRIOR TO RUNNING CHKLISTS UNLESS PART OF A BRIEFING INVOLVING BOTH PLTS. LEAVE ENOUGH TIME DURING SINGLE ENG TAXI TO CONSIDER THE NON-ROUTINE ITEM WHICH OCCUR FROM TIME TO TIME. MAKE A NOTATION ON THE FLAP SETTING PAGE OF THE ACARS WT AND BAL PAGE DESIGNATING THE SERIES ACFT. DON'T KEEP SECRETS ABOUT OPERATIONAL INCIDENTS OF A RECURRING NATURE. A SMART MAN LEARNS FROM HIS MISTAKES -- A WISE MAN LEARNS FROM THE MISTAKES OF OTHERS.