You have a 1985 GMC Jimmy S1500 the column shifter gets locked up in park even in the on position with the engine running Sometimes the key gets locked in the on position too?
not sure but check the left side of the tranny and there maybe a cable hooked to the shift arm that goes to the steering column that locks the key in the on posistion !!!! if so unhook it from the trans. and push the arm up on the column hopefuly that will solve it !!!!!!!!!!!