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Message: <blockquote data-quote="Rickk55tn" data-source="post: 28224" data-attributes="member: 15211"><p>After re-reading the Carfax report and the title it is, in fact, listed as a 2000 GMC Sierra C3500 HD box truck. And, yet, no matter what search terms I use I cannot find any maintenance manuals. The Duramax manuals are all over both Amazon and eBay but, that's no help since mine has a 6.5L diesel from 1999 (actual year of manufacture). Keep finding bits and pieces and (just guessing here) I'm probably going to end up making my own manual.</p></blockquote><p></p>