Yes its a dually, yes its a 60, with 4:56 unless the axels have been swapped, no its not mine but I did go look at it, I could probally answer some questions if the owner isn't available
http://www.ksl.com/index.php?sid=&nid=443&tab=list/view&ad=298003
http://www.ksl.com/index.php?sid=&nid=443&tab=list/view&ad=298003