You do not say what year the vehicle is nor what size engine or transmission type you have. So this answer is a best guess scenario. I have had this experience in reverse with my Dodge Dakota where my speedometer would not register until I got to 30km/h. In my vase it was due to the ABS speed sensor located in the rear differential. It provided the low speed input to the ECM and the transmission VSS provided the higher speed input. I would not suspect the speedometer unit first since you have some operation of it. I would look to the transmission VSS as a most likely suspect.
SOURCE: rpm goes to 3000 but truck not moving to speed
Yes, it is your transmission. Watch the video at this link for a better understanding...
http://www.ehow.com/video_4908599_symptoms-slipping-transmission.html
Testimonial: "Pointed me into the right confirmation of the issue I was having with the transmission and possible issue to check first, before taking it to the mech"
SOURCE: The idle speed and running
This is the throttle positioning sensor that is causing this. You can unplug the tps and see if it changes. The throttle positioning sensor is located on the air intake of the throttle body. Here is a picture of it.
It is not holding in overdrive.
It might be a throttle position sensor is dirty and sending information to the computer to downshift. It could also be a vacuum leak somewhere in the engine induction. If it has not been tuned up recently, start there.
It might not hurt to check with a dealership to see if there are technical Service Bulletins issued for what you are experiencing.
The transmission filter should be changed if it has not been changed in 75000 Km. and the pan checked for excessive debris which might indicate to look forther at the transmission if that does not clear it up.
SOURCE: speed goes up only to 30km/p
sorry bro you have internal leakage of your gear it could be o ring damage but try first to change the gear oil then if not take out your valve body for cleaning and replacing gasket
You need to have a OBD2 fault code test run. That is the 1st step.
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