i was driving on the motorway at 70 when it jumped out of gear, i pulled on to hard shoulder, still sounded fine . pulled away again back up to speed as normal but no 5th gear, it feels like it goes into gear but when i press the gas the engine revs but no drive in 5th. all other gears are fantastic. also since this happend there is a rather loud sort of gringing knocking noise, its not there all the time tho. the slower you go the slower the noise . please help.