You need to use a later VSSB that came with a 4l80e or 4l60e transmission instead of the drac you have now. I think they are in the dash on the left side of the glove box compartment when you remove the glove box, you will have a little rewiring but the VSSB can still be used for everything that your drac was used for like speedometer, abs, cruise, pcm, etc.
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