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My truck is an 01 F250 7.3PSD. A few weeks ago the abs light started kinda fading in and out and then stay on for a while the go away then come back then fade again. At first I thought it was simply a ground issue. I inspected all the wires and connectors I could see, even check the wires to ground looking for shorts, didn't find anything wrong.
Then last week the infamous Speedo signal stopped and o/d light would flash and the abs light stayed on constant. After reading a bunch on here I decided it must be the rear speed sensor. So I pulled it inspected the tone ring while I had it out through the hole and it looked good, the sensor ohm'd out ok, I did note metal shavings on the sensor but they went bad at all. I replaced the sensor anyway, what's 13 bucks if it might fix it.
Sure enough the symptoms didn't disappear. So after more reading on here, this past weekend I changed the rear diff oil. And that fixed everything. Then on my test drive about 20 min in the abs light started coming on the Speedo and o/d light worked normal.
So it's fixed- ish, or so I thought. Today on my way home from work the Speedo stopped and o/d light came back flashing.
Sorry for the long post but I'm so frustrated with this thing and really could use some help.
Thanks in advance for any help you can provide,
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