Dead transmission? No power to wheels

I just did a motor/tranny swap on my 96 Prelude: I installed a JDM H22,
and the original 5-speed tranny that was paired with that engine. After
installing the axles, I noticed that they spun freely, even when the
tranny was in gear. After bleeding the clutch, I started the engine,
put it in gear, and let out the cluch. I could hear the "normal" noise
when the clutch is released in neutral, but nothing else happened. No
drop on the tach, no power to the wheels at all. With the front end
jacked, the wheels turn freely when the transmission is in gear. The
shift selector feels perfect, but the tranny acts like it's always in
neutral. Could it be that the axle isn't in the tranny all the way? Or
does this sound like an internal tranny problem? Is there something I
can do to further isolate the problem? I spun the wheels and watched
from the bottom of the car, and both axles turn all the way to where
they attach to the tranny, and there's no tranny oil leaking from where
they attach.

Thanks in advance for any replies!