I have had an 2002 400ex and i now have a 2005. I have to owners manual from both machines sitting right in front of me.
2002 400ex:
"Primary reduction 2.826
Gear ratio 1st 2.917
2nd 1.938
3rd 1.474
4th 1.182
5th 1.000"
2005 400ex
"Primary reduction 2.826
Gear ratio 1st 2.727
2nd 1.789
3rd 1.363
4th 1.080
5th 0.925.........
Reverse gear ratio 2.428"
Just an FYI thing for thos who are wondering