You are right, it is my deductive reasoning. I pointed out that if the transmission had accelerometers that knew the vehicle speed, it may as well tell the speedometer so they could both benefit.
I am aware of the device. It is reasonably accurate over a quarter mile. Then it must be reset.
Let me know if you find a Gtech inside your transmission.
Here is the link for the transmission speed sensor. It is item 4. There are two of them. Looks a lot like a magnetic pickup. It counts the revolutions of a shaft, and converts that into a rotational velocity. That shaft speed converts to a vehicle speed via the final drive ratio and tire diameter. Not sure of your model, but this is for the latest 3.0 X3 they had.
http://www.realoem.com/bmw/showparts...97&hg=24&fg=15
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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