My 19 sti only has 10k miles on it and I’m getting 2nd gear grind from the 1-2 upshift. Never happens on a downshift. After I let the tranny warm up for a bit it’s better but 2nd is still way more notchy and rough than all the others. When the grind happens it’s usually towards the end of the throw. Took it to the dealer all I got was that they couldn’t replicate. I had the tranny flushed at 7k because I hated the way oem fluid shifted. Any advice? Any driving/ shifting tips? I do live in Canada so it is quite colder right now.