i found this 01 400ex talked to the guy he said it runs good no smoke and rear bearings are good. here it is take a look and tell me what u think. thanks http://quincy.craigslist.org/mcy/2343108587.html
yep, about half had tranny problems in 01 they fixed it before releasing the 02 model2001 Raptor 660's are the only ones that had major problems.