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5. The Advance Adapters tailshaft kit comes with a new output shaft, an output-shaft seal, a reluctor ring, and a sensor. The new reluctor ring is what your speed sensor reads, and since it is now in front of the transfer case it will not think the vehicle's transmission is slipping when it's in 4-Lo. This prevents the electronically controlled transmission from putting the truck into limp-home mode, for if the sensor were still located in the transfer case the transmission may believe that it is slipping when the 4:1 gear reduction is engaged.

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