My speedometer stopped working suddenly yesterday.
I am able to turn the cable and see the speedometer as I do it.

Thus the drive speedo gear or the inner shaft speed gear is likely bad right?

What would cause either of these 2 gears to strip? I did shift down to low yesterday at low 10mph speed.... gently D to 2nd and then 2nd to Low. (TH350 automatic) . Driving in low seemed a little rough but cant tell for sure.

I dont want to go changing a plastic gear for it to just strip again if there is something causing this, that I have another issue.


Thanks in advance for input.

 

The cable is stamped into a square shape and fits in the gear. I'd suspect that the female end of the driven gear has gotten worn more so than a stripped gears scenario. But it could happen. You're going to have to have a look and see. Pretty easy to repair....er replace.

 

Actually the root cause is usually a bad speedo cable. This causes excessive drag on the gears, and one or both wear out.