65 Dart 6 cyl rad

What is the difference between a 4 spd rad and a 3 speed rad if any ?
I just figured if I could save some $$ by finding a GOOD used unit I would but it is looking like a rebuild,.

Johnny Dart said

Do you have the original 4spd radiator, from the car ?

If so, thats a fairly rare radiator.

Why not just rebuild it ?

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