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  1. R

    Topkick C4500 6.6 LB7/LMM

    We have 2 2007 C4500s that had failed Harmonic Balancers, one for which this thread is started for had a broken crank as a result. The other has dropped a cylinder and has yet to be torn down. (is this a common problem at 98k and 114k miles?) We acquired a LB7 Longblock and installed and can...