If the speedometer and odometer are both not working, I would blame the speed sensor. If only the speedometer does not work and the odometer does work, the cluster is bad.
did you check the speed sensor on the side of the transmission?
Output speed sensor
Is the TCM working normally and throwing no codes?
If the speed sensor is broken several things can happen. The speedometer will not work and the transmission may not shift correctly.
Does your odometer work? If the speed sensor goes faulty both speedometer and odometer stop working.
The speed sensor sends a signal to the speedometer to show the correct speed and it sends a signal to the transmission telling when to shift. If the speed sensor is bad the speedometer will not work and the transmission will not shift correctly.
It is either the speed sensor or the wiring. Have it checked out.
Your speedometer doesn't work.
Your speedometer won't work.
It is probably the speed sensor. It is located on the transmission and sends an electrical signal to the speedometer.
No, the 700R4 speed sensor will not work in a TH350 transmission, as they use different speed sensor designs and mounting configurations. The TH350 typically relies on a mechanical speedometer drive, while the 700R4 uses an electronic speed sensor. To retrofit a 700R4 speed sensor into a TH350, significant modifications would be required, including changes to the transmission and potential adjustments to the vehicle's wiring and speedometer system.