drive train on 1993 Ford E-150

drive train would not go in to reverse when engine is hot

Asked by for the 1993 Ford E-150
Are you sure this is a 1993 with a 5.0L V8? I'm not showing this combination in 1993.

If it is indeed a 5.0, you probably have a fully mechanical AOD transmission. This is vacuum operated. I would look for a possible vacuum supply issue. You could have an internal mechanical concern too.