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  1. Rear Diff Problem up! help!

    06-07 LBZ & LLY Duramax Powertrain
    so yesterday i noticed while turning that the truck squels and drags one tire when going around a turn like the rear is locked up? what could it be it disengages some times and turns with out an issue but some times and makes so weird noises especially when backing up. popped the plug fluid was...