okay so almost a year ago, my speedometer started acting up. It started that it would read fine when I was giving it gas, but as soon as I let off the throttle, the needle would fall to zero. next, on top of this; when i was going 90, it would only read about 50, and when i was going 50 it would read like 20 and it slowlly worked its way right down to zero where it now stays all the time. Also, the odometer stopped going up as well. once it finally went to zero, i got a code for speed sensor so i replaced the speed sensor. The spedometer worked great for about a day, then slowly did the exact same thing where it worked its way down to zero where it sits again. the needle wasn't jbouncing around at all, it would still read a constant speed, just extremely slower than i was actually going. Also, when it first started staying at zero, sometimes if i gave the throttle a little blip, it would jump up to about fifty, but then fall back to zero.
I replaced the speed sensor- that worked for maybe a day.
I checked the wires from the speed sensor all the way to the dash for connectivity- they're fine.
The odometer is still lit up, It just maybe goes up a km every few days if at all.
The needle sits at zero all the time, and never moves.
all that's left really is the actual gauge itself, but I still have the speed sensor code, so I'm at a loss for ideas.
Any help would be greatly appreciated!!

 

Replace the guage cluster. It's probably going bad like everything else. If you say that you got power everywhere and that u just replaced the sensor... Replace the guage or the cluster itself. But that's my .02 cents

 

would i still be getting a speed sensor code though if the guage isn't working??

 

Did you try tightening the screws connecting the speedo to the gauge?

 

lol nope ill try that..

 

My bet is a transmission problem. Either the plastic gear in the transmission the turns the vehicle speed sensor is worn out, or your differential bearings are so worn that the gear described above is not fully (or even partially) meshing with the gear on the vehicle speed sensor, causing it to give erroneous readings.

 

There is some good troubleshooting/diagnostic information in the 4th gen FSM under EL Meters and Gauges section.

 

crap this is highly likely the cause then, cause it's not acting up like a wiring problem. As well, my axel seals are leaking like mad (already replaced em once).. guess it's time to look into the whole differential bearing problem realistically how hard is it to change them? comparatively to putting a new clutch and rear main seal in?