'04 FSE 450 gearbox issues!!!

[mikethebike1127]

Gears have stopped engaging properly......going up the box she is OK if using the clutch however, when giving it "the beans" and clutch-less changes, it goes into every gear but the second you back-off and unload the transmission, she slips into a false neutral (between all gears!!). Going down the box is a similar story...clutch and blip it down and she's OK but if you try clutch-less down changes she's also finding false neutrals. Any ideas??? Just to add......this problem appeared out of the blue (ie no a gradual deterioration in gear changes) and is affect all gears so can only assume this rules out selector forks!! All help welcome. Cheers. Mike.