I need to identify a special ford tool with part # T537 - 4616 - A - DET 1?

4616 is the Ford "basic" number for a differential pinion bearing race, so I would guess that it's either the tool, or part of the tool needed to install the bearing race into the differential housing. I think you made a typo error in the prefix though. It probably SHOULD be T53T, not T537. 53 denotes the year, 1953. Hope this helps.