Good Morning Jim,
Code Reader>>Here in California I can go to the local Autozone and they will loan me a code reader that reads most of the codes generated by our trucks. I understand that there are some codes that can't be read by most code readers. I have to give them my credit card & drives license to take the reader outside, plug it in and read the codes. As I remember, the reader is about $180.00 or so. I don't recall the brand name but has to be "OBD II" compatible.
Odd Shifting>>>I had something similar happen awhile back and it turned out to be the "VSS" (Vehicle Speed Sensor) mounted on the top of the differintial. $25.00 from Ford and about 10 minutes to install. I don't recall the code that was set, the VSS replacement fixed the problem. I suspect that the shifting is the transmission shifting from overdrive back to 3rd gear and then going back into overdrive.
I hope that this helps, others here may have better ideas than I.
Gary
Code Reader>>Here in California I can go to the local Autozone and they will loan me a code reader that reads most of the codes generated by our trucks. I understand that there are some codes that can't be read by most code readers. I have to give them my credit card & drives license to take the reader outside, plug it in and read the codes. As I remember, the reader is about $180.00 or so. I don't recall the brand name but has to be "OBD II" compatible.
Odd Shifting>>>I had something similar happen awhile back and it turned out to be the "VSS" (Vehicle Speed Sensor) mounted on the top of the differintial. $25.00 from Ford and about 10 minutes to install. I don't recall the code that was set, the VSS replacement fixed the problem. I suspect that the shifting is the transmission shifting from overdrive back to 3rd gear and then going back into overdrive.
I hope that this helps, others here may have better ideas than I.
Gary
