speedometer quit working today and automatic shifting was very rough, on 1999 Ford F-250 Super Duty

also abs light comes on. What is causing this? Thanks

by in Sour Lake, TX on February 19, 2013
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3 answers 6 comments
ANSWER by , February 19, 2013
Scan test!!
ANSWER by , February 19, 2013
rear differential speed sensor.I could fill a swimming pool with all of them that I have replaced over the years.
COMMENT by , February 23, 2013
I thought that sensor was just for ABS, did not know it affected spedo. operation. Good to know!
COMMENT by , July 03, 2014
mine is doing the same thing speedometer stoped working shifted hard till the abs light came on and then shifted fine I changed the speed sensor in the rear diff. plus the connector still did it it is up a ford now they changed out the abs control moduler. but it is still doing it and its still at ford they don't know what is wrong with it
COMMENT by , July 03, 2014
Ain't always what ya think it is for sure.... What fixes one just might not fix the next one!!!
COMMENT by , August 24, 2014
my truck speedometer worked fine but was shifting really hard replaced rear speed sensor and the abs light stays on and is still shifting really hard (late shifting). (before the abs light would come on and off). what should i do next 99 f250 superduty bone stock
COMMENT by , August 25, 2014
Have the throttle position sensor (TPS) checked for erratic signal with a scanner... or DVOM.... Have the ABS scanned also!... Good scan test is much better than 'anybody's' guess!!!
COMMENT by , August 25, 2014
the only code that pops up is the veical speed sensor and ia have changed it out twice with luck. what would be be next step
ANSWER by , February 20, 2013
agree with double for sure. poss fill a large lake