Speedometer
Is it possible to adjust the speedometer?
Comment
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Comment by Kurt on May 8, 2013 at 4:37pm
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Don't know what to tell you, It's got the correct gear.
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Comment by Jason Edge on May 8, 2013 at 4:31pm
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Kurt, to get a 10mpg difference at 60/70 mpg you would need be looking at a 16.67% difference and would need a very short (25 or 26") wheel vs the stock 29/30" original bias ply. I've only seen a difference change like that back when I put 40" mudders on my 1980 Chevy Scottsdale that probably came with 31" tires/wheels.
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What tires are you running? Mine does the same thing. It is because the radial tires I'm using are smaller diameter that the stock bias ply. I don't know if the speedo can be adjusted.
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Has the rear end/differential or the speedometer gear in the transmission been changed? There were 2.94 an 3.21 gears for non-ac vs ac cars and will throw speedometer off about 9% if you don't have the right speedometer gear in the transmission to match the rear end ratio.
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