92 Ranger,4cyl 5spd tranny problem

Son was driving down the highway, something went bang and engine died. With clutch in, engine will start and run. Let out clutch in any gear and engine dies. Let out clutch in neutral, it runs. I'm assuming transmission is broken. How hard of a fix. Only replacement we can find is a rebuilt for $750. Truck isn't worth that to fix. Anybody know what usually breaks? cluster gear? synchros? input shaft? I've got experience on older manuals, mostly the old Muncies and Ford top loaders and feel comfortable I can rebuild this, but would like some idea of what I'm up against before I tear it apart. Thanx...

maybe something to do with the neutral safety switch, id just have it checked out and see if thats the problem

you are correct about the tranny being busted...I had the same thing happen in my 94 a year ago...then it happened again with my salvage replacement...good luck p.s....it is probably that one of the shaft bearings blew out...common problem