Personally-I'd use a DDEC 6V-92TA with a 3000MH (400hp and 1200lb/ft torque [more than the 6V-92TA can safely put out]) world transmission without PTO since it has the addition of two overdrives and is shorter than the HT740. Good LUck, TomC
Cruise speed for a turbo 2 stroke should be between 1600 and 1800. Cruise speed on an electronic 4 stroke should be 1400 to 1600 for best economy.Brian- what rear end ratio do you have and what tires? Most likely they don't want the 6th speed engaged since most bus drivers would drive the bus to fast. The reality is that Allison designed the 6th speed to only go down to 1400 since they didn't like the transmission to be lugged in 6th. So when the transmission gets to 1400 in 6th it will down shift to 5th. The other gears can go down to 1100 at times of light pedal use. Let me know your stats on your bus and I can tell you whether 6th should be activated. Series 60 is good for lugging down to 1100. The 2007 engines will be torque rated at 1100rpm, so they allow 100rpm below that. So with the new 2007 engine, 1000rpm is all right! Good Luck, TomC