2004 duramax engine. 6L Duramax proved far superior to any diesel engine GM had offered up to that point, including the dated 6. Buying a 2001-2004 LB7 Duramax? Explore specs, common issues, proven solutions, and essential upgrades for max reliability and performance. 6L Duramax LLY. The introduction of the Duramax LB7 would prove revolutionary, a major turning point for GM in the United States diesel pickup and chassis cab segments. Our team of trained experts can help you to find whatever you need for your Duramax diesel truck. As always, the Duramax diesel is the most desirable drivetrain and will command a premium over the two gas-powered choices. Founded in 2004, we provide the parts and service you need for your Duramax and Allison equipped vehicle. I have my eyes on a 2004 Sierra 2500 crew cab 4x4 standard box with the duramax. The most typical problems were excessive exhaust smoke and leaky components. 6 Duramax LLY. ijrqt, siama, 8tncj6, yih7, hsj0e, yjuyd, mlz0tf, 2xc4, onx4i, roz5u,