Speed O jumping around
08-29-2017, 12:03 PM
#1
Member
Thread Starter
Speed O jumping around
I had a weird thing happen to me on the way to work today. My speedometer was not reading correctly. I was going along about 65 or 70 MPH but the speedometer was jumping around from 60 to 75 then at one point dropped down to 45 and jumped around there then back up to 70 mph. it jumped around for 15 to 20 miles then it started working correctly. Also while this was going on the overdrive light on the gear shift was flashing. Any ideas?
08-29-2017, 02:57 PM
#2
Senior Member
What year is your truck? If 97 or 98 your speedometer gear is probably bad. 10mm socket, it's located on the driver side transmission tailshaft. Pull it out, probably teeth chewed off.
08-29-2017, 03:14 PM
#3
Senior Member
Bad VSS for your year.
08-29-2017, 04:00 PM
#5
Member
Thread Starter
Ok vehicle speed sensor. It looks like it is just a mag pick up. I will attempt that thank you. It might have gotten wet or something from all the Harvey rain. We didn't get it as bad as most though.