Nick 240

ok i recently did a ka24e to a ka24de swap on my 90 240sx hatch and motor is fine but i hear a grinding of the throwout bearing in my tranny when i have my foot off of the clutch. When i push it in the grinding stops. I greased everything and made sure i put it together right. i even pushed the fork in where the slave cylinder goes to check for clearance and it had clearance. I have no idea what it could be. Please help!!