all brakes locked up?

The truck is 2005 my bad. I replaced both front calipers, both rear wheel cylinders, all of the lines, the booster, the master cylinder, and both front hoses. i bled them until the fluid came out in a stream, but my pedal is still pretty spongy. My rear is locked up completely and my front is spinnable but i can tell it's also locked up a little. i also replaced all the ball joints while i was down there if that makes a difference. i am just a wrench monkey with no actual knowledge of how to diagnose issues, so any insight into what the cause is would be appreciated.