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stock diff.

  1. Too much on stock differential and axles??

    4.6L Tech
    I have 3.90 that are not installed but planning on getting them installed and getting the zex kit off american muscle and putting the 75 shot on my car. Will it be ok to run that on the stock diff. and axles or would it be wiser to go with 31 spline before i do all of that? thanks
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