You’ve got questions, we’ve got answers. We work with the Summit Racing tech department to help you tackle your auto-related conundrums. In this week’s Mailbag, we’re discussing mating an electric speedometer to a cable-driven Turbo 350 transmission. Q: I have a 1990 Chevy S-10 pickup with a 350 engine, a Turbo 350 transmission, a 9-inch ford rear axle
Q: I am having trouble finding the correct speedometer gear for my 1970 Mustang. The car has a top loader 4-speed transmission and a 4.10:1 rear-end ratio. I’m running 26-inch-tall rear tires, and a 21-tooth speedometer driven gear. The 21-tooth gear is the largest I can find, and the speedometer reads about 27 mph fast.
Q: I recently had a new set of tires installed. I opted to go with a larger diameter than the originals that were on the car. Will this affect the accuracy of my speedometer? How do I check? A: There is a good chance you need to recalibrate your speedometer whenever you’ve changed tire size or altered your gear
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