I too am adding 3:55 rear end and was wondering the same thing. I got my SCT from Roe. I know they can send me an updated tune via email so I bet they can also adjust the tune for the gear change in that emailed tune. I will call Roe tomorrow and ask.
I wanted to do that 6 yrs ago, and if I recall Dan told me it was not possible. I think that is part of the BCM and not part of the engine controller. I have a brand new box that I never installed, so my mileage shows much higher than it actually is. Youv'e got to cut into your wiring harness to install that box, something I decided I would never do.
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