Hi, bought a 601 workmaster w/ a 4 speed trans, about 2 months ago with a bushog. It's been running well until this week. Going down a small hill I've gone up and down many times, it went into neutral. No forward or reverse gears. I opened top of shifter, there's plenty of fluid not milky, no broken anything I can see, shift plate moves with a screwdriver, gears seem to turn some but not more than aprx 15 deg.. Closed it up, still no gears. There's was no warning, no grinding, no noise etc. Shift lever feels normal, but when letting out clutch, nothing. Any ideas? Thx!