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Power Strokes
6.7 Tech
speedo recal'
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[QUOTE="Big Angry Hillbilly, post: 532279, member: 4453"] You can only calibrate speedometers using IDS to other factory available tire sizes. I went though this with a customer who's mustang I installed 4.10 gears in. I was told by Ford that it has to do with emissions, believe it or not. Vehicle load/speed/rpm changes with tire size and its outside the parameters available from the factory that the vehicle was tested at. Same goes for gear ratio. I'm not sure if this has changed at all, been awhile since I tried to do it. If you can manually edit the VID block somehow you could also change it. For the most part, aftermarket programmers or a gizmo that fools the speedo is required. (The deal that fools the PCM signal from the vehicle speed sensor I believe only works on a stick shift so you're kind of up a creek there). [/QUOTE]
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