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📺 Subscribe to Second Shift Performance: https://www.youtube.com/@secondshiftperformance?sub_confirmation=1 In this video we have swapped the 3.7L I5 engine for a 5.3L V8 from a Chevy Tahoe and are wiring in the Tahoe ECM/TCM to work with the I5 ECM. This video is part #15 in our 5.3L Swapping A 2007 Hummer H3 Playlist: https://www.youtube ...
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