Speedometer does not work,only the neutral and reverse lights come on,are there any sensors I can check or replace before I buy a new speedo

Assuming that your van is driving smoothly and your gears are shifting smoothly, start by checking your tranny fluid level. If it is low, that may be one of a few possible problems. If fluid level is fine, your speedo sensor may have a loose connection or could be going out which is what may be triggering the check engine light. I had that happen on my Jeep Cherokee. Speed sensor stopped working and the light was on constantly. Remember, if your speedometer sensor does not work, your odometer and trip meter will not turn either. Speedo sensors are not very expensive and pretty easy to change. Start with the easy tasks first: check fluids, check connections, replace sensor. If that doesn't work, get it into a shop (or talented and well tool-supplied buddy) and get a code(s) for the problems. Good luck!

the neutral switch might be the reason for our back up light check the wire fron the neutral switch speed sensoe all goes at the in the same harness maybe harness overheat on exhaust or melted in the neutral switch check it out let me know pierre

the speedo and odometer are both worked from the VSS ( (vehicle speed sensor)
check for the reason of metal on the sensor end
could have an internal problem that is not allowing the shifting down so have the transmission check out bat an accredited transmission shop

I am no expert on this but have the same problem. Here is where I am at. I bought the truck used, needed a new PCM which after installing one from a gas job and verifying that wiring was good, bought a reman from Chrysler. Speedo still did not work even though it did with the gas PCM but was fluctuating allover. Chrysler replaced PCM and speedo started to work intermittantly. Took truck into dealer and $600. later told mechanic thought it was faulty PCM. He called Chrysler and asked them to pull one from the shelf and test. They said needed a new crankshaft speed sensor.Mechanic took truck on the road, shifted into nuetral then turned ignition back on, speedo works. Replaced crankshaft speed sensor and situation didn't change. Total spent $1000. and no speedo and no overdrive. Speedo started working intermittantly, seemed like depending on transmission temperature. Friend that works on dodge said is instrument cluster. tried another cluster still the same. Replaced ignition switch, thinking that may be the problem. Still the same. Bought a new Neutral starting switch, which I have not replaced as of yet. If I place truck in neutral and start the truck speedometer is activated right away but does not stay. So right now am down to two scenarios. The neutral starting switch or,...... the temp sensor in the oil line. Feeling is it is the neutral starting switch. By the way had already replaced speed sensor in tranny and rear end. Going to replace neutral starting switch, cost is $25. for the part and see what happens. Please keep us posted, as others are having the same problem.

If your odometer is working but you have no speedo check your connection at the speed sensor first. Is your Check engine light on?
If so check for speed sensor codes. if your odometer & speedo are both out your may be having a problem in your sppedo head which will require repair or replacement.

Its a rear speed sensor on top of your diff case its around 30 bucks if you do it yourself only one stud/nut, the 99 durango does not have a speedo cable.

Theres a sensor on top of the rear axle called a speed sensor replace it , That will fix the abs and speedo problems.

well going off of typical chrysler problems and since I dont have the car or any codes I would say professionally speaking,replace the input and output sensors on the trans get them thru chrysler they are pretty cheap $15.00 each or so have a goodd day DB
Sensor Location Views M - T

It may be a faulty speedometer with a short inside, or a short on speedometer wirings or connector.

Whenever car vibration cause the wiring to short, there you lose speedometer and trans functionality.

You need to access the speedometer connector and wirings to
instrument panel to fix this.

Depending on whether your speedo is mechanical (uses a cable), or electronic (uses an electrical wire to carry the signal from the sender), I would look it (what's in between the speedo and trans speed sender) before replacing the instrument panel. A good service manual that includes a dash wiring diagram should help trouble shoot this problem.
Good luck.