Im wanting to find out how deere raised the blade tip speed for there 06. We bought a 777 72" and I feel the extra speed really maxed out the power of the 27hp Kaw. I would like to convert mine back to the 05 where the speed was around 16000fps instead of 18000fps. Im hoping to get more torque to the blades. It bogs down so much now that the blades are turning slower anyways. Im think it may be the pully on the back of the deck that is the double stack pully where the pto belt and the deck drive belt come togather? Does any one have any exact information on this? or has any one had an 05 and and 06 72" deere to compare.