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lly 1093 with race valve?

  1. 04.5-05 LLY Duramax Powertrain
    New to site, any help appreciated. 2004 stock chevy silverado 2wd dually. truck has 350,000 highway miles. well maintained due to company policy of monthly inspects on top of yearly DOT inspects. Truck runs great except when pulling long grades with a "heavy" load on it. Never happened before...