Is it possible to put a newer Cat rear suspension under my 580Ext? *http://www.snowmobileworld-s2.com/forums/iB_html/non-cgi/emoticons/confused.gif I would like to upgrade it this year,the sleds solid but the sus. isnt the greatest under their.I think it has the 8.5 rear travel and I know they make that "long legs kit" but I might be able to run this route cheaper?

m-10 is the way to go on that sled. *Rode with one in the same year thundercat for year. ran great.

yes you can put ett in your sled, I am doing mine right now
e-mail this guy Dardaves@aol.com he has the detailed instructions for hassle free installation for a small donation.
bought a zr suspension off of e-bay for $200.00