[KVenom]

I have come across this '55 with a 292V8 and automatic transmission. Appears to be a decent surivor car. At issue is that it is in need of a ring gear. The part is available but it looks like the gear is to be welded to the converter.
Has anyone had any experience with this particular issue? Remove engine or transmission?
Also, I have no idea what automatic transmission Ford installed in the year car. Would this be an FMX?

Any help or direction to some sights that can help me would be greatly appreciated!
Thank you!
Terry Riebel