While shifting in 5th gear wouldn't go into gear or any gear. with ign. on and when pushing in clutch and trying to push start, it acts like its in gear. Only shifts thru gears with ign. off.

I had no signs of anything wrong with truck... No fluids leaking, no slipping of tranny,
no noises of any kind and all fluids are full, but while I was driving and shifting into 5th
gear the clutch went all the way to floor and wouldn't go into gear. As I coasted and
was slowing down tried to shift into all gears but wouldn't go into any gear and acted
like there was no clutch. Now, the truck will shift into all gears as long as the ignition is
off, but when I turn the key on, it will not roll with clutch in and it will not go into any
gears, acts like it is in gear though. Tried to start it in gear but it wore the battery
down.