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it's easy to find all the info on your truck. what you want to do is find the RPO codes. they are listed on the big white sticker in the glove box. there will be a whole list of 3 didget codes. each code is something on you truck from the engine to gear ratio to trans and interior options. once you write all those codes down you can look on the net and there are many differant sites that will explain what each code means i did it on my 03 2500 HD. from google or yahoo type in gm rpo codes and then just look at each site untill you find one you like or that gives you the best descriptions they are there. good luck and if you have a code you can't find or just want my help to do these just e-mail me the codes and your e-mail address and i'll let you know the info you want.