I have a 2008 650h1 4x4, bought it brand new back Dec 2009. Warrenty went out 6/2010.... Went riding over weekend and the "Front Differential" locked up and broke both front axels. Lucky me I was not going fast. I have researched this problem and it is a known problem with these bikes, I have also contacted Artic Cat and they are not willing to help, they are directing me to go to my dealer and get the problem diagnosed at my expense and if my dealer reports it to AC Technical Service they might be willing to pay for the parts "MIGHT" those famous words. Meanwhile I am out of a bike to ride plus money out of my pocket either way you look Im either paying for Diagnosis, Labor, or parts. I like the bike but not happy with Artic Cat on backing their products. Does anyone have any sugestions???