Join Date: Sep 1999
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Re: 87 S-Blazer tire upgrade
It shouldn't be a really big deal. Your truck should have a gear driven speedo, so you can take it to a speedometer shop and have them do it for you. From what I know about it, it's not an exact science, but it will get you within 1-2% accuracy, I believe. Most of those corrections are with aftermarket parts, not GM.
Or, you can just find out what your real speed is vs. what you have on the odometer and go from there. The 235's shouldn't make that much of a difference in your speedometer reading. Maybe 3-5 mph difference. I have never had mine corrected, although I may do it this time when I get larger tires put on my '98 (which I think involves a computer reprogram in my case).
Hope that helps.
[img]/wwwthreads_images/icons/shocked.gif[/img]- <font color=purple>J.R.</font color=purple> -[img]/wwwthreads_images/icons/shocked.gif[/img]