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Originally Posted by Heavy Duty
The speed sensor doesn't care what gear you are in, it measure RP M's of the output shaft,
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Correct if you only have 1 transmission
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one revolution equals so many rpms of the drive tires, it is fixed by rear gears and tire size, the speedometer still works if you coast out of gear.
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In this case, with the VSS on the output shaft of the 13 speed, if you were to coast with the aux. trans in neutral, the speedometer would read zero.
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if you don't change rear gears or tire size no adjustment is necessary.
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With the VSS on the output shaft of the 13 speed you would effectively be changing the final drive ratio whenever the aux. trans is in any gear except direct.
In his stock configuration, the VSS is on the output shaft of the 13 speed.
If you put an auxiliary transmission behind the 13 speed and leave the VSS where it is, the only time the truck's speedometer will read accurately is when the aux. is in direct. When the aux. is in an underdrive or overdrive ratio, the truck will go slower or faster, respectively, rendering the speedometer inaccurate.
The solution to this is to move the VSS to the output shaft of the auxiliary.
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