I have a complete FD Ricambi 5-speed syncro transmission in my 650 powered Fiat 500. It has been flawless for 12,000 km but last week 5th gear just gave up. Driving along in 5th, it suddenly went away - just spins. All other gears are fine. Pulled the engine & tranny and removed the nose cone and top cover yesterday. The top shaft is moving fore / aft quite a bit. Both bearings are sliding on the case where I would assume these should be a press fit. Does anyone know what holds these bearings in position? It moves so far forward, the gear on the end disengages the lower shaft gear completely.