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You have an output shaft speed sensor on the top of the tailhouse on the transmission. If it fails though, you should get a code P0720. If you aren't getting any codes, makes me wonder if it isn't a problem with your cluster. May be cheap enough just to swap that out to see. I am not sure which of the two, OSS or the VSS sends the speedometer signal of the top of my head.
**EDIT** looks like the axle sensor they are calling a wheel speed sensor, so I think an assumption that the OSS would be the one to send a signal that will feed the speedometer, but like I say....when it fails, you should be getting a code...
2010 CCLB Lariat Black w/ Adobe Accent - 2.5 inch lift springs front, 4 inch blocks in back, DPF/Cat deleted with Mini Max, S&B CAI, Kenwood DNX9990HD, RF Punch 10" downfiring in custom center console, RF 300 watt amp, Bakflip F1 bedcover with BakBox, OEM rear camera, Jensen front camera routed through both mirror and H/U with switcher, billet grill,......
Last edited by f250Jason; 09-22-2012 at 01:37 PM.