First off, the car is a 2005 Legacy GT 5MT, 210,000 KMs with a few basic mods, nothing too crazy. The clutch failed a bit ago and I had to get it towed because it wouldn't properly engage/disengage. Turned out the friction plate came apart.
So I installed a replacement exedy clutch and flywheel, the install went pretty smooth.
I also changed the tranny oil, using redline 75W90NS.
When taking it for a test drive I noticed immediately a relatively nasty grinding when shifting both up and down into second. All the other gears are ok. The only other issue is a smaller grinding shifting into first while coasting at low speeds. I have tried double clutching, rev matching, different speeds and nothing seems to help with the grinding.
Im reluctant to tear everything apart and reinspect the clutch install as I'm not sure if that is the issue.
There was no grinding when shifting before I had to replace the clutch.
Things I have read and what I can think of are,
1.Clutch is not disengaging the transmission properly, maybe a problem with the fork or the throw out bearing on the shaft. I did notice a bit of play in the fork when inspecting it. The nose of the shaft the where the TOB sits also did seem slightly worn.. ie. the bearing had a bit of play on the shaft.
OR
2.The sycros are bad in second and possibly first, and the change in fluid just let the problem crop up.
I'm not sure if there is anything else that could be looked at before tearing the entire thing apart again, and I hoped that someone on here may be kind enough to offer some insight. I was also considering taking the car to a dealer and seeing what they thought of the issue.
Thanks!