Duramax diesel
A buddy of mine has an 06 with the allison trans. The 06 was redesigned over the 04 and 05. 06 actually has more power. He also put in a Bullydog programmer and WOW what a diff. He pulls a 32 foot camper, even thru the mountians, and doesnt even notice it. I think the 07 is down in power but made to run on the new diesel fuel out. Go for the Chevy. I was told buy a GM service rep if its a HD with an Allison trans there is nothing you can do that wont be covered by warranty.
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