You can buy a converter that does not need a shaft changed for non lockup.
The AOD is driven directly from the converter when the trany shifts to 3rd gear.
you can buy a converter that has been modified internally .
I have such a converter in an AOD behind a 300 inline 6 .
call mon-friday 1-800-274-7223.... ask for Randal.
I am not Randal, I work with him.
Dont worry how old you are... it is the mileage on your body that adds up.