* Dirty or contaminated transmission fluid.
* Faulty transmission shift solenoids.
* Faulty transmission governor.
* Faulty transmission speed sensor.
* Faulty transmission control module (TCM).
* Faulty wiring or connectors in the transmission control system.
*Faulty or incorrect throttle position sensor.
*Faulty or incorrect brake light switch.
*Faulty or incorrect reverse light switch.
*Faulty or incorrect speedometer sensor.
*Faulty or incorrect clutch or one way clutch.
