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I have a similar deal through Wells Fargo: They loaned me $7700 through a "Three year, equal payment, no interest" deal. With them, it was very clear cut: $7700 divided by 36 equal payments, resulting in a monthly payment of $213.90. No one has called or contacted me to even suggest that I pay less per month or anything. Knock wood, this has gone like clockwork.
I'm very interested to see how the OP's situation works out.
I just borrowed $7000 in December from Wells Fargo (new windows for my house) per the terms of the three year "equal payment - no interest" deal. They set my payments up at $194 per month. $194 X 36 = $6984. I am going to be ok because for simplicity's sake I have been sending them a $200 check each month but if I went by their payment schedule I would have ended up being $16 short. I don't know why the numbers don't add up but it's always best to double check the terms on any zero interest deal.