I would suspect the speed sensor has gone bad.
No, because the transmission control module and speedometer will not line up, so it will not work.
what exactly is wrong?
1996 and newer have an electronic speedometer and a vehicle speed sensor that operates your electronic speedometer and also sends a signal to the powertrain control module (PCM) The PCM uses this signal to control several different functions of the engine and transmission.. Your 1996 doesn't have a conventional speedometer cable.
One of the speed sensors runs the speedometer/odometer and transmission shift patterns, other speed sensors run the abs and or traction control.
It does not have a cable. It is all controled by the PCM. Power train control module / COMPUTER.
The speedometer and transmission issues in a 2003 Pontiac Grand Prix could be caused by a malfunctioning vehicle speed sensor (VSS), which provides speed data to the speedometer and transmission control module. Additionally, a faulty wiring connection or a blown fuse could disrupt the signal. Another possibility is a problem with the transmission control module itself, which could prevent the transmission from shifting properly. It's advisable to diagnose the issue with a scan tool to check for error codes related to these components.
Theres a speed control sensor on the transmission which went on my 1992 they replaced it and now its fine.
your tcm (trans. control module) will store a code and the symptoms will include inop. speedometer or out of calibration.
On a 1989 Mercury Grand Marquis, the cruise control speed sensor is typically located on the transmission or near the speedometer gear. It may be mounted on the transmission case or connected to the vehicle's speedometer cable. To access it, you might need to lift the vehicle and inspect the transmission area. Always refer to the vehicle's service manual for specific details and diagrams.
The vehicle speed sensor is mounted on the transmission, but on 2000 and later models the VSS is combined with the rear axle sensor located on top of the differential. The powertrain control module uses the sensor input signal for several different engine and transmission control functions. The VSS signal also drives the speedometer on the instrument panel.
Typically, you can find the transmission modulator valve near the rear of the transmission. Its function is to control and regulate pressure.
The odometer and speedometer not working, along with transmission shifting issues on a 1995 Ford Bronco, could be caused by a malfunctioning Vehicle Speed Sensor (VSS), which provides speed data to both the speedometer and the transmission control module. Additionally, issues with the wiring or connectors related to the VSS, or a failing instrument cluster, could also contribute to these problems. Lastly, low transmission fluid levels or a failing transmission could further complicate shifting performance.