Yikes, went to shift my 580K from 2nd to third (was stopped) and now it won't move,??

I have a phase 3 ser# JJG0025?96 (shifter on the side connsel), I went to shift from 2nd to third and when I put it back in forward........... nothing. now it won"t move forward or back in any gear. I'm hoping it's just the auto neutral solenoid stuck but I'm not usually that lucky.