ZF6 stuck in gear

Hey guys my 99 f250 12v cummins is stuck in 4th gear. I pulled it last night and at the end of the track it was stuck in 4th. Even if the shifter is in neutral, or any other gear, it is still in 4th. What could my issue possibly be? I'm in the process of pulling the trans right now and honestly I know nothing about the inside of a transmission. Any pointers, ideas, or similar experiences, or anybody selling a zf6 4x4 please chime in!!
Thanks
James


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Did you get 'er figured out?

pull the shifter off and look down inside? broken fork?