Hello my name is Dave.
You didn't mention if your truck is gas or diesel, if it is a diesel it has the Asian transmission and that transmission has 2 speed sensors for that year. I have a lot of experience with the diesel version of this truck and if you could get back to us as to which one it is it would help us narrow the possibilities.
Either version are known for wiring issues, especially to the transmission. If it is the Asian transmission and your speedometer is not working the output speed sensor that give the speedometer it's signal is on the top left of the rear of the transmission just behind the transmission mount, it's a little tricky but it will come out with out removing the mount, however I would first check that the wire and plug appear to be in good condition, there is a pigtail that has a plug at each end and they are common to rub through and also for the plugs to become brittle and the pins back out.
If you could update us with the engine/transmission you have we will be able to assist you more accurately. We look forward to hearing back from you soon and thank you for using 2CarPros!
Wednesday, June 24th, 2020 AT 10:03 AM