As suggested, i had a look on line. No conclusive answers and he did seem to change over the years - metal Link to Brilhart to Berg Larsen to Selmer, according to one view.
Here's one claim that I find interesting "Johnny Hodges used a Brilhart mouthpiece modified to implement a tenor reed. This gave him the ability to smear notes to an incredible minor 3rd".
I've read that Earl Bostic did the same - anyone ever tried that? It seems an interesting - and strange - thing to do!
The master (Yes you Pete) also has something to say on the subject on one forum:
"What setup with a NEW alto can give you a sound that resembles Johnny Hodges?
When you say "YOU" presumably you mean "you", ie you not "me" or "us".
I'm not trying to be funny, but you, me or us playing the same set up would not sound like him.
What might make sound (a bit) like him is not the same as what might make you or someone else sound (a bit) like him.
I have been asked in the past on film recording sessions to sound like Johnny Hodges, and I managed to get away with it. (well I got paid, Mr Coppola like it and they used the cue in the movie!)
My horn was an Adolphe Sax, the mouthpiece was a Vandoren Java A45 (only because I was endorsing them at the time).
I think that if I'd used the same horn and mouthpiece/reed as Johnny Hodges, I may not have pulled it off.'
So I guess that answers my question!