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The two-wheel-drive (RWD) mode on a truck is known as 2H mode. This mode is primarily used on normal roads and provides optimal fuel efficiency. When the truck is in 2H mode, the front and rear wheels drive, and the gear ratios are normal. Some vehicles do not have the 2H option, but if you …

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A TCM is an electronic device that controls how the transmission shifts gears. When the TCM is malfunctioning, the engine cannot reach the desired speed and the transmission fails to shift gears at the right time. A bad TCM can also cause the vehicle to kick and jump unexpectedly, resulting in a dangerous situation. Here …

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