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  1. J

    4l80e to sm465

    I have a 1999 suburban c2500 with L29 7.4L. I've dug around on here for several days to see if I could find what I'm looking for, but no luck.... but forgive me if I missed it. Anyway, I want to put the sm465 behind the 454. What I'm not sure about, and my specific question is: Is the ECM...
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