Great truck, '05 GMC Sierra 2500HD Duramax is the king of diesels. Wish it had bigger wheels/tires(17-18"), and the interior stinks if trying to sleep. Front seats do not recline all the way, very uncomforable to sleep in. I drive long distances through the night at times and know I cant sleep in this truck. Only mechanical drawback/weak link is the Allison transmission. It is weak and needs more beef, especially in the torque converter and C3/C4 clutchs.
I like the stereo and the design of the stock wheels, just wish they were a little bigger.
Allison transmission is weak! Needs a better torque converter and clutch. Block needs studs instead of head bolts. Driver's side exhaust manifold is crimped/choked down for no reason. Better seats that recline all the way.