I've always had third gear grinding issue but it feels like the situation has gotten worse now.

Shifting to ANY gear over 4000rpm gives me a moment of resistance, then it goes through. Suppose I shift from second to third, it gets stopped, then it continues right after. This "stop" is much more clear in down shifts.

Down shifting anywhere above 2000rpm just doesn't work anymore. There is an obvious force preventing me to down shift, followed by squeeling noise (if forced harder), then nasty grinds if really forced.

In neutral with the clutch pressed and shifting into first (at a stop), sometimes I hear a metal rubbing sound and sometimes I don't.

I know this is enough information to add up to an obvious, long and expensive answer. Anyone know?

By the way, it's a 6-speed transmission with LSD so I don't think Honda will work on it (or would they).