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  1. W

    C10 4l80 swap help

    71 c10 with ls3 psi wiring harness ecu38 and tcm42. 4l60 went out did swap to 4l80 used psi plug n play adapter. Installed 2 different 4l80 and get below codes on both transmission. Goes into overdrive the first time then code come back after clearing. What am I missing? Everything else works...
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