Yes, they could be related. The speed sensor is mounted to the diff. It
could have come loose or it could have failed. I am not sure I would blame
the failure on the service, but it could be related and maybe it simply came
out of adjustment. (I have vehicles where the sensor can be changed with
different gearing options, and the various gear sizes require adjustment.
The mechanic could have removed the sensor and simply failed to adjust it
properly, now the gears do not make contact.)
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