2004 Chevy Silverado 2500 HD, 2WD, extended cab, long bed with the Duramax diesel and Allison transmission.

http://www.drs32.com/Images/Clean%20Truck.jpg

I bought this vehicle to tow a 12,000 lb. RV and it has done a fine job, towing over 40,000 miles with a total of 72,000 miles on the odometer.

That's a good looking truck.

Does it have the lb7 or the lly Duramax? (The lly was released late in '04.)

Welcome to the site. You'll get a lot of good information here.