If you can't get it to stay... yeah tranny has to come back out. One of the prongs might be pushed up and its only catching one or something got bent up or who knows what. It should definitely stay in place on its own.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.