3rd Gear Grind Under Load

So i've been having this problem for a while, but it was a little more pronounced today than usual. Any time I shift into 3rd gear above 6k rpm there's a little bit of a grind. It's never rejected a shift. At first I thought I was just driving sloppy, but even slowing down the shift and making sure the clutch is all the way to the floor it still happens. No other gears have this problem. I searched it and found that motor mounts going bad could be the culprit. Do you guys have any other suggestions before I spend money to fix it?



As always,

Thanks everybody!