2004 Ford Ranger 4x4 XLT - speedometer problems (that are more than just it bouncing)

[mhuitt]

Question: I've replaced the wheel sensors, the hubs, the ABS wires, and everything I can think of (that I can do) to fix this. Still a problem. The speedometer is fine for about twenty minutes, then it'll start jumping all over and feels like the truck is losing speed when it does that.

What could it be?

 

[sgtsandman]

Just to be sure, you checked the ABS/Speed sensor and it's wiring in the rear differential, correct?

 

[mhuitt]

Just to be sure, you checked the ABS/Speed sensor and it's wiring in the rear differential, correct?

I had a mechanic shop check it out three weeks ago (and I fixed everything on the diagnostic) because of this problem. They didn't say anything about any electrical (outside the wheel hub ABS sensor). Do you mean the sensor on top of the rear differential? I replaced that and the one on the transmission in front a few days ago.

Still have the issue.

Would the tone ring be the problem? Or the differential itself? Not a pro mechanic or anything (me and my neighbor fix up what we can on our vehicles) but I am starting to think in that direction (tone ring, differential). And when I took the back sensor off, it dripped a couple drops of what look like water.

But I could live without the speedometer if need be (phones have MPH now on them) but the loss of speed (it seems) when it does that is more my concern.