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Re: Need help identifying harness
Sure your looking at the right side of the connection? Gm harnesses have C, J, and X designation on harness headers like that. Depending on the donor, you may have an X header/plug, but be referencing the diagram from a vehicle using a J header. We went through this on a fellow members LS3 swap.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING 
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