I have actually replaced the first large gear a few weeks ago with another used gear (I actually have two used speedometer heads from gas models). I haven't pulled the cluster yet to see if the same gear has broken again.

What I am concerned about is whether there is something binding in the odometer which is causing the gear to break.

One more thing. Before the odometer stopped yesterday morning, it was reading about 10%-20% too low. I think it has been reading low since I replaced the large gear, but don't know for sure. I didn't count teeth on the replacement gear, but I believe all models use the same gear in this application. Is that true?

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Tom Evans
69 280SE 91K (wish I still had it)
73 220D 98K
78 300D 134K
78 300D 185K
81 300SD 301K (still have)
82 300SD 321K (still have)
84 300D 268K
84 6.2 Diesel GMC Suburban 225K (a whole different story!)