speedometer registers faster than the truck is moving

Asked by Aug 27, 2016 at 04:12 PM about the 1991 GMC Sierra 1500 K1500 4WD Extended Cab SB

Question type: General

2 Answers

1,445

check the automobiles tyre size is correct as per the original specification, also I would get a qualified technician at your local shop to calibrate the speedo as it wouldn't have been calibrated from new.

1 of 1 people found this helpful.
69,275

This may be normal. Back in the early to mid '90s GM was calibrating speedometers to read slightly higher than your actual speed. This was to help avoid speeding tickets. My '93 Caprice read 4 MPH higher than I was really going. I bought that car new, BTW. HTH. -Jim

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