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Overdrive or ABS light

503 views 0 replies 1 participant last post by  Supertek94 
#1 ·
I have a '06 F-250 Super Duty with 153K highway miles. Recently started a 62mile daily commute and noticed the fuel economy was not what I remembered for the open road; getting 15-16 mpg. I also have experienced 3or 4 occurrences of a momentary shudder after driving at 70 mph on cruise control where the ABS light comes on and it seems like the rpms drop from about 1900 to 1800; almost like it just shifted into overdrive...which could explain the low mpg. I tested it this morning by dropping from "D" to "3", and the rpms revved as it downshifted... went back to "D" and the rpms went back to 1900. Put it in Tow/Haul and nothing happened...not sure if it will engage at 70 mph. How can I tell if it is in overdrive? Any thoughts on these symptoms? Could this be a vacuum problem?
 
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