chances are by driving it home, all the teeth broken off second gear have flown around inside your box and damaged all the other gears and synchro's, seagull (neil) may still have a couple of complete gearbox for sale for around the $1200-$1500 mark, defianately your cheapest option, maybe send him a pm to see if he has one that matches your gear ratio's

are you runing an upgraded HD clutch? if so that may have caused it