All integration harnesses on this page will be for use with the 1988 - 1999 Chevrolet/GMC GMT4xx Series of vehicles. Also known as "OBS" or "Old Body Style", these vehicles are listed below.

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                                                                         Source: Wikipedia

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All integration harnesses currently require a factory harness from the exact Year/Make/Model of the vehicle being swapped. Harnesses that are different may cause integration issues due to changes in the wiring between years, options, and trim levels. If you do not have one available, LS Harness Connection may attempt to locate and purchase one for use.

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Integration harnesses will use the factory fuse block and OEM PCM mount