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Onstar - Going From Old Analog To New Digital System

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This question is reguarding my '03 Chevy 1500HD that has OnStar, but it no longer works because it's the old analog system. My '06 SS has it too, but it's the digital system. It can be converted to digital from analog, but it costs like $200.+ to have the dealer do it. I have been told there is a single part that makes the converision. Has anyone done this them selfs by buying the part from their dealer? Didn't know if you guys with '03 & '04 SS's have run into this. I would really appreciate some help on this. Thanks.

Edited by TheGeorgiaKid (see edit history)
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