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The tone ring in the differential will turn at the same speed as your tires so no difference. You are only changing the ratio that your engine sees so you do nothing and the speedometer reads correctly.
The tach is driven by the engine computer so no changes are needed there either. You will notice slower rpm at 55-60 than you have now and that is all.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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