Hi,
It is odd that it started only after the differential was replaced. Was it replaced with an exact replacement? In other words, is the gear ratio the same in the new differential?
Since the drive shaft would have been removed, it is possible that by accident, the vehicle speed sensor at the rear of the transmission may have been damaged or disconnected.
Take a look at the picture I attached. It shows the location of the sensor on the transmission. Have him check it. Also, let me know if the speedometer is properly working, and if diagnostic trouble codes have been checked.
I will watch for your reply.
Joe
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Monday, October 19th, 2020 AT 11:10 AM
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