This is a great site, I am sure I will be using alot in the future. We are looking at buying a 2000 gmc 6.5 1 ton dually with 170k on it. What should I look for, The truck does not look abused, in good shape, But I dont know a thing about diesels. It starts great even when hot, it shifts real smooth no matter how hard I lay on the fuel and feels real tight. We have a 2001 ford expedition with half the km and the ford doesnt feel as tight. What should I look for?The deal is going down monday. Sorry for going on. Thanks Archie. Smithers B.C.