My Si D-series trans grinds only when shifting from 2 to 3rd at higher Rpms and I hope its just my clutch not the syncros and also I just changed the fluid in it and when it does this it does'nt want to go into any gear even when i slow down or stop and so when I put it in 5th when i am stoped then it will go easly into any gear. What could this be other than the Clutch????

any help is great h:

 

I would say syncros if it wont go in any gear except 5th and then it will go to other gears..

 

How do u drive the car?? Do u shift easy or hard? If hard it prob. gonna to be your syncros. you could replace the fuild with some GM syncromesh and see if that helps. Mine use to grind a little and i replace the fuilds with the syncromesh and it seems to helped. HIH

 

So if its my syncros then what should I replace? How would I do this?

 

Try the GM syncromesh first that might fix the prob. If it doesn't dont waste your money on a rebuild, you can find D series trannys for cheap all day.