89 PGT, my gears ran away please help
 

okay, so me and my friend are driving my car... we shift out of 3rd to go into second to slow down for some tracks. driving really slow, being nice to the car not beating on it or anything... then it wont go into second, try first no first.. no 3rd no 4th no 5th only reverse... so then we coast into a small parking lot, mess around with it, get 2nd and reverse... drive back to my house, pop the hood I noticed the tranny mount bolt on the back was out, but still laying on the subframe, thought awesome, just put it back in and things will be fine.. put it in, still the same... shifts great into second and reverse... but thats it. theres no holes, no problem. nothing sounds good, clutch disengages properly. I can't figure it out for the life of me, sucks big time. please help me.

89 probe gt.