I believe you'd have to use an app like AlfaOBD. I'm not fully sure of the process, you'll probably have to research the forums for a how to.
GDE will not support it going forward, as it is the pre EPA compliant tune. If you opt to use this ECM with the existing tune intact, you'd be on your own.
You can use the VIN lookup tool from ram site to verify your gear ratio, or look for the sticker on your rear axle.
Don't think it matters if it's 4WD, since it still relies on the primary axle ratio. Mine is 4WD.
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