Sensor on the differential is keeping it in 2WD mode, you won't have 4WD until this is fixed. Since you say it's stuck in 4WD it won't come out until the sensor is changed.
Not sure what you mean by transmission selector sensor. The transmission range sensor reads what position you have selected with the gear shift lever.
It allows you to manually shift the transmission when the selector is in the L position.
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On the transmission selector you put your shifter in neutral position and then you can move the transfer case selector to high or low.
That means the switch on the gearbox or lever is stuck for some reason.
you need to buy a new one. it must be the correct legnth with no play or you will have transmission out of sync with gear indicator or worse pop out of park by itself.sorry i just reread question.not sure if you are asking about actual shifter cable or gear indicator on dash or console
It is possible if the selector doesn't lock in to position. Also check the transmission fluid level. Low fluid will also be a factor. There could also be other issues that should be looked at by a professional, reliable transmission shop.
On a 1997 Dodge truck, the neutral switch, also known as the transmission range selector switch, is typically located on the transmission itself. It is mounted on the side of the transmission and is connected to the gear selector mechanism. This switch helps determine the position of the transmission and ensures that the vehicle can only start in park or neutral. For specific access, you may need to lift the truck and remove any protective covers to reach it.
press down hard on foot brake at the same time move shifter.
The selector lever.
You have probably turned off the overdrive function of the automatic transmission. Look for a small button on the gear selector reachable with your thumb.
sounds like transmission problems