[Deus Ex Verra]

Alright, this is a pretty in depth question I know, but what would be necessary to do an engine swap. I'm not really interested in performing one but I'm just curious and trying to learn what I can about this.

To start things simple, lets assume we're going to drop in a Turn-key Crate engine that is of similair size to the one its replacing. Let's also say they are both V8's with 32 Valves.

The most pressing question I have concerns the transmission: What would mandate a transmission upgrade to accomodate the new engine? I know that a significant power difference could be a cause, but what else? Are there some situations where a new transmission is not necessary, just something like a new clutch or flywheel or something of that manner?

Much appreciated.