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adjusting speedo on a 91 crewcab?
got a 91 454/4l80 crewcab I'm working on for a friend. speedo reads way too high, with the electronic speedo. pretty sure someone put a 3.42 or 3.23 gear in the rearend. how do you adjust the speed sensor setup from the factory? they had to have a way to do it.
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