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95 S_Trucker · 12-31-2013, 05:00 PM

I would recommend plugging a gps in and seeing what your speedo says vs the gps. Your tire sizes are fairly close. And the difference wouldn't be huge.

12-31-2013, 05:00 PM	#6
95 S_Trucker Registered User Join Date: Oct 2009 Location: . Posts: 2,180	Re: 1997 gmc speedo recalibration I would recommend plugging a gps in and seeing what your speedo says vs the gps. Your tire sizes are fairly close. And the difference wouldn't be huge.