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  1. Duramax Third Generation: 2006-2007.5 (LBZ & LLY)
    My truck, 06 duramax LBZ Allison I was towing my 27’ travel trailer. I had to push a bit to merge on freeway. Engine rpm was much higher than normal when shifting in to next gears. I’m guessing it was in 3rd when engine rpm was much higher than normal shift points. Wondering why it occurred...
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