Speedo correct, incorrect, then correct?
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Joined: Nov 2009
Posts: 18
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From: Western KY
Speedo correct, incorrect, then correct?
Hey Guys, I haven't had this truck (F250 SD Xcab 2wd 5.4) but about a month and have been thinking the speedo was a little off. Today I finally put my gps in the truck and took a drive and here is what I found..... up to 45, it works within the acceptable 1-2 mph, but when I go to 50 on the speedo, I go to 60 by the gps. As I speed up and the gps gets to 65, the speedo has climbed back up to the correct readings of just a little slower than what the gps is reading. The speedo doesn't jump up, it just moves a little faster as it catches back up. Then it will stay within spec's up to as fast as I took it, 80-82. It does this everytime and is consistant. Does anyone have an answer? Or has anyone had a problem like this?
I did a search of the forum and about all I found was some people mentioned the speed sensor on the rear diff. messing up and causing erratic jumps in their readings.
Rick
I did a search of the forum and about all I found was some people mentioned the speed sensor on the rear diff. messing up and causing erratic jumps in their readings.
Rick
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Joined: Jul 2003
Posts: 1,273
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I just changed that sensor today on a sd truck I recently bought. Could not find it in the books as a speed sensor. Its listed in the aftermarket books as an abs sensor. I have a connection at a parts warehouse. Mine was $20 out the door. It would not hurt to swap it and see.
