A buddy of mine has them on his 660 Grizz. It did fine in 2WD until he broke the drive shaft. Here is a link to his bike, and he is also in a few more videos that I have posted on Youtube.
<a href="http://www.youtube.com/watch?v=DuhlH5lwNFw" target="_blank">http://www.youtube.com/watch?v=DuhlH5lwNFw</a>
<a href="http://www.youtube.com/watch?v=DuhlH5lwNFw" target="_blank">http://www.youtube.com/watch?v=DuhlH5lwNFw</a>
