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Message: <blockquote data-quote="JorgeS" data-source="post: 27051" data-attributes="member: 12094">GM made a LOT of GMT800s. They ran from 1999-2006 (some lower volumes even later), 7 years, making between 1.2 and 1.8 million per year; probably over 11 million total.There are a lot still running around. Many OE parts are certainly discontinued by now, since GM can stop providing service parts (I believe) 10 years after the last year of manufacture. Because of the high voluimes made, there is a very strong aftermarket for parts. I can't think of any parts that would not be available. Even the digital/automatic climate control module controller in my 2005 Yukon is available from more than one aftermarket source.Their main weakness is rusty brake lines and rusty fuel lines.</blockquote>