Classic/Antique Car Repair: hello, train of thought, oil water

Question
hi, i have a 65 mustang and my transmission has water in it. when i run my car the oil & water mixed and came out of the transmission i just replaced my radiator also . i would appreciate your advise greatly. thank you very much.

Answer
Really kinda hard to follow your train of thought here. Did the leak occur in the new radiator? before and thats the reason for the new radiator? Before and you just haven't flushed it enough?

Also, I hope you mean water and transmission fluid, not oil.