weird 3rd gear

[DxCR]

This kinda reminds me of when I destroyed a synchro in my 7. It would always whine, then started to grind. It almost seems like something on the top rack in the tranny is lodged in the dog gears, causing the assembly to spin, even in neutral. Picking up another tranny is probably the best idea. If you haven't already, get rid of the stupid modular clutch. It has some issues of it's own that isn't gear friendly.