I drive a 2001 Chevy 2500HD Duramax/Allison daily. I love it. For a straight axle you could drop a F#$D Dana 60 under the 2500 frame... I personally would not change the drivetrain in my 2001 truck a bit, but it is a matter of Preference. CJ
Dad.... I never knew there was something other than a Chevy to drive.....