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When I had my avalanche tuned, I told them the wrong gear ratio. I thought I had the 345 gears, turns out I had the 410 gears... Speedo was off by 10mph. Drove me crazy.
If you have a tuner who already tunes your stuff its fairly easy to flash a small change like that into the tune. They will probably hook you up for some beer money. Or if you don't have a local tuner, HP tuners credit is $100 plus the tuners fee for going in and making the change.
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