Transmission fluid in the coolant radiator? I don't think that there is any. However, the 4EAT trans has it's own radiator so as far as I know you won't lose any trans fluid when you swap out the coolant radiator. Do you have an AT of 5MT?
edit: I re read your post. I guess you meant you also swapped out your trans radiator hoses? I bet zip ties would be a good temp fix, but not the best way to go.