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Re: How long would it take to replace the output speed...
!/2 hr-1hr. labor, on hoist. 1/2 should do it. part will be $15-$45 depending on your particular transmission. Unless you were talking about ABS speed sensor.
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There is an input and output speed sensor. They look identical. The input is just user the cooler hoses and the output is to the right as your standing in front of the ven.
A one inch socket will work to remove them. The hole in the transmission will be slightly smaller than one inch. If you need an exact size you can remove one of them nod measure it.
If I remember right there are TWO input speed sensors. My '99 Grand caravan did what your did and The dealer recommended replacing both at the same time. I did and it cleared the problem.
The transmission is going into failsafe mode, meaning the computer is seeing an electrical problem and turning off all solenoids locking it into on gear. Best bet is to get a scan tool and read the codes in the transmission module, common problems are the input and output speed sensors. If you are having problems with the speedometer, you probably need an output speed sensor. I've also had problems with pressure switch codes that have lead to replacing the valve body. If you have a speed sensor code i recommend replacing both the input and output speed sensors, they screw into the front side of the transmission.
1. Check the speedometer cable maybe its not properly connected or you need to buy a new one.
2. If your having a problem with the gear check the transmission oil add some if the oil level is low or check the pressure plate and the release bearing and I hardly recommend to visit a good mechanic.
I am assuming you have a 4-speed transmission? There are 2-speed sensor on the front of the transmission. Input and Output Speed Sensors. They are level with each other, right above the top line of the Solenoid (wiring harness goes into this box-like assembly) The one that is closest to the Solenoid is the Input Sensor. The one (at the same level) towards the left side of the van is the Output sensor. I believe a 1-in wrench will work, after you unplug the sensors. Torque going-on for both is 20 ft-lbs. Before replacing the sensors - you may remove the sensors and clean the metal particles off the interior tips of the sensors and reinstall and check operations. Start with removal, cleaning, replacing the Output Speed Sensor as the Speedometer Info is directly involved with this. If cleaning does not fix the problem then replace it and check operations, before replacing the Input Speed Sensor. This will save you money from replacing both sensor. Let me know if this helped, or if you have additional information or questions. Feel free to contact me at fixya.com
Theres 2 they are on top of the trans. The input is closest to the engine,below the trans lines going into the trans. The output is to the right of the lines about foot still on top. 1 inch deep well socket need to remove. 20 lbs torque. Make sure to use new o-ring
you have a output speed sensor cuircut issue, scan tool would be helpful for this repair, but here goes, the sesor return wire is picking up rf interferance, in the harness, start by searching front of trans , to side fender to tcm, in wheel well area to over wheel well to bulkhead, possible corrsion as well. GOOD LUCK RDJRP
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