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
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