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Tone Ring

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Putting a 9-inch in a late-model truck sometimes poses tech-laden obstacles. In the later-model F-150s, a tone ring is used in the rear differential. This tone ring supplies a signal that's used to trigger transmission shift points and speedometer readings. To make up for the deleted tone ring, a new ring was fitted to the rear driveshaft yoke, and the tone-ring sensor was relocated. Problem solved.

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