Thanks, but what I'm talking about is the time saved doing the work. You'd only have to unbolt the transmission from the engine once, and only have to bolt them back together once, if you did them at the same time. If you did the engine by itself, then a month later the transmission, you'd have to do that part twice.
I think it's easier to remove the transmission when removing the engine, because it's easier to get to the top bolts with the intake manifold off the engine. That sorta thing. Are we talking about saving an hour, or half a day, or what? That's what I'd like to know from those that have done this kinda work before.