i had 2 06s and liked them i like the interior and it just seemed it had more power than the o5s and the g56 was stought to an extent but the i had a sbc dd

 

We got an 05 its has the G56 it take some getting use to but my tank is allumin but it look after market cause the welds look like poop.

 

My last one before the 06 was an 04.5 and by far, my favorite truck to date...I will always miss that particular truck...My 06 is ok but I hate the tranny, I am thinking the 08 will be another favorite...

 

the plastic intercooler was only in the early '05's and that is also the same timeframe for the G56 trans introduction and the in-tank lift pump.
IMHO if I were to get another it would be an '04.5 because if the aluminum I/C, NV5600 and filter mounted LP. The in-tank LP sucks if you want to go to something else, there is added cost to get rid of the in-tank pump(not to mention dropping the tank) the 5600 is plenty strong with an aftermarket clutch. The auto's are pretty much the same from '03.5 to '07, there were some software changes thru out the years. '06 and up is the only auto that is approved for an exhaust brake.

 

well right now i am chasing 2. both trucks are just about equiped the same and both are just as clean. one is a 06 with 30,500 miles and the other is a 04.5 with 24,500..