Changing rear gears

Nickerson

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I am changing my rear differential ring and pinion to 3:54.1 ratio in my 2006 Viper. What do I have to change to keep the speedometer correct?
Thank you
 

MoparMap

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The speedometer runs off of the wheel speed sensors, so I believe it should auto adjust without you having to do anything. It just cares how fast the wheels are turning, not the transmission like earlier cars.
 
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