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97 GMC Van Speedo Calibration
Posted to Technical Discussion Forum on 7/27/2004 2 Replies

OK, I thought I'd have this figured out in a jiffy, but here I am.

97 GMC G20 Van, 5.7L. Customer installed oversized tires and now the speedo reads about 10% high. How would one go about changing that? I thought I could reflash it, but I don't see such opti... Login to read more.

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