Have you tried shifting while the bike is off? If you can shift OK, you probably have only broken (or dislodged) the circlip that holds it in place inside the casing... If that's the case, just cut a piece of rubber hose to length on the shift shaft from the cover to the shift lever (I used 1/2 in. heater hose from True Value). Replace the shift lever and you should be good to go.
2001 Vulcan 750 - "Jeter", AKA: "the Incredible Vulc"
Updates from stock:
F&S Engine guard
F&S Luggage rack
F&S custom floorboards
Saddlebags & supports
12v plug (SAE connection to battery tender)