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So! Turns out that my +2009 4L70E was an earlier model. Thanks to Russell (Holley Tech) we changed Transmission Type to 4L60E and removed the "Advanced"...
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Maybe this might help. I had the same issue although with an LS2. Turns out my +2009 4L70E running the 588-405 was not a +2009, so I changed the Transmission...
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