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I've had my obs 1999 GMC C2500 suburban with l29 454 vortec 3.73 gears for 6 years, stock 245/75/16 tires the speedo read to high this is from ecm
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Aug 22, 2023
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I've had my obs 1999 GMC C2500 suburban with l29 454 vortec 3.73 gears for 6 years, stock 245/75/16 tires the speedo read to high this is from ecm
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