Q: Truck not starting.
The truck only goes into gear when in four wheel drive high and the speedometer goes up when no gas has been given.
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Your transfer case may have an internal issue or a shift linkage issue may be the cause. I recommend you have a qualified technician check to see if the transfer case is defective or you have just a linkage issue. Have this inspected from a certified mechanic, such as one from YourMechanic.
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