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  1. Need to knows on LLY's

    04.5-05 LLY Duramax Powertrain
    Well im looking at a 04.5 lly thats got 175k on it, im not so worried as the miles as i am on the lly motors, what all goes wrong with them and what should i look for as i go look at it, and any mods i can do to prevent them from breaking or melting down?