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6.0 powersmoker advice

  1. Need help building tranny for 650hp what should be upgraded?

    6.0L Performance Parts Discussion
    Upgrading my transmission to hold 650 HP km sure a lot of u guys have already done this step so throw some pointers my way I just got a quote for 3300$ is that reasonable that's taken out and installed too? Thanks for anyone help advice ..also someone told me to just by a used built tranny?..