I have a 06 si, the tranny was grinding 1st 2nd and 3rd any time i shifted above 4k, then it got to the point that the car wouldnt shift above 4k. so last week i bought a new tranny and i got it in today, the car is not wanting to go in to gear above 6k, it has a brand new cluch, flywheel and like i said a new tranny.it will shift above 6k only when the car is cold or its the first shifts of the day but once it warms up it all gos down the craper. this is the same way the first tranny i took out started. I dont know what ealse it could be, can sombody please help me. maybe throw out some ideas.