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It's more than just getting it connected, the car's ECU will need to be modified as well. You will need a custom tune to make the ECU accept a trans it wasn't designed for. It might be easier to sell the trans you have (the 6 speed), then go and buy an 8HP70 that your 550 originally came with. Less hassle, the connectors will fit, and no customm coding will be necessary.
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