904 automatic transmission not shifting on any gears

When we spin the input shaft from the front of the transmission by hand while looking at the output shaft from the rear tail of the tranny - IT DOES NOT SPIN! We tried on all gears and it doesn't spin - ONLY just a centimeter of movement. Now when i put it on park i shouldn't be able to spin the input shaft... well this tranny you can STILL spin the input shaft by hand in park but output shaft still has the same problem as mention above.

What your describing is normal. When the engine is not spinning the torque converter the oil pump isn't spinning to produce hydraulic pressure to lock up the clutch packs. The input shaft will always spin no matter what gear you have it in. Only the output shaft is locked.