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Speedometer bounces from 30 mph to 100 mph changed speed sensor 4.2 v6 automatic transmission unplug speed senor runs great but other electrical issue start

(1999 Ford F-150)
in Geneva, AL on March 21, 2016
Not originally Tran been told wrong trans. Or computer
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on March 21, 2016
How about the sensor on top of the rear differential... Replace it also? .. Yeah, I know it's the RABS sensor BUT also sends vehicle speed input to speedometer!
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on March 22, 2016
Worth a try I'll let you know
on March 22, 2016
Check the wiring and the wire connector going TO that sensor as well, it is exposed to road debris.
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