clotus wrote:
05-07 (before the body change) is the best. The 05 can be tuned to an 06, but the 06/07 had some stronger internals. I believe the 05 will yield a little better fuel mileage because of the less aggressive tune, but give up a little power. In the end 05-07 is the best Duramax, but good luck finding one for a good price, they are highly coveted. Can probably pick up a newer truck for the same price. Good luck, I wanted an 05-07 Dmax, but could not find what I was looking for and ended up with the Dodge in my sig and have been very happy with it (minus the fuel mileage).
In some states, like AZ, if you find a good early model body, you can =build= whatever engine you want and only have to meet the mfr plate's model year requirements on equipment =and= emissions. Find an '02-03 and drop an LBZ in it! :-) This is what I'd =love= to do!
Lyle