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Transmission and speedometer quick working on 1996 Chevrolet Lumina

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
After I changed the serpentine belt, the transmission doesn't shift and the speedometer doesn't work. What could I have touched or undone?
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(2) Comments
vehicle speed sensor is below the engine on the same side. did the belt break and fly around??

Roy
No, I needed a new serpentine belt for inspection and my husband changed it for me and then the transmission won't shift and the speedometer doesn't work.
there is a sensor below the area where the belt is located on the passenger side. if that is disconnected, then it will cause problems. have him use a flashlight and look around. it is a 2 wire sensor.

Roy