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The speed odometer acts up. Sometimes when the vehicle is in park it will read 20mph or 50mph. The speed will increase as the vehicle moves. Do you know what would cause this?
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If the odometer is correct, the problem is in the speedometer head. If the odometer is also not accurate, it may be the speed sensor in the transmission.
If you have got taller tires on then what it came with from the factory it will definitly throw the speedometer off.You will need it to be recalibrated for a different speedometer gear put in the transmission.This will correct the odometer
I've seen some that can be shifted while in park, but generally even when that is possible, it is always better to shift while rolling at a slow speed (under 20mph). When all components are turning, it's easier for them to properly engage without grinding.. If after you are finished using 4x4, the front axle does not disengage, you can usually get it to do so by disengaging the shifter, then backing up for about ten to twenty feet.
May want to see if the parts store gave you a good sensor or not. Also May want to check and see if you have a transmission input and output sensor as well. these will also give you the same symptoms. Whatever it is, the transmission is not sending the speed signal to your ECU which is in turn not sending the right shift points until its too late causing the hard shifting and also since the ECU doesnt have a speed signal you may not get an odometer/speedometer reading (one or both may go out). Hope this gives you some direction. Good luck. Thanks for using fixya.
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