Hello I am fairly new to this community. I got A 6MT 07 tsx that I bought back in November (6months ago) and I love the car! Always enjoy driving it and never had a problem until yesterday. I always engage my clutch all the way and as I was pulling my car from 2nd to 3rd it grinds and ever since then it’s been doing it non stop. It’s only happening when I was in high rpm abojt 5k rpms. If I down shift from 4th to 3rd it doesn’t do it though unless I am at a high rate of speed and try downshifting and it will do it again. When I am city driving or not pulling the car it goes into it very smoothly. Idk what’s going on I’m checking all over and before I even think abojt bringing it to a shop and spending thousands to get it fixed I want to know is there anything I can try to fix it that might help? From other forums I found its saying it might need a clutch adjustment and from other it’s saying if you have a cold air intake installed it might be hitting the shifter cable. I’m not sure yet and like I said I want to try some thing before I spend all this money to fix it. Also I never had changed the transmission fluid since I got it so will that might be a solution if I change it? Also what’s the best gear oil for the transmission and what weight do I buy?