Not sure what transmission you have but if one of the TH’s (350 or 400) but a different size wheel & tire combination along with the incorrect speedo gear in the trans can easily cause the incorrect reading on the speedometer….there are calibration charts on the internet just put in your tire height and rear end gear should tell the correct speedo gear you need to use in the side of the trans…..
Awesome information that I never knew.
And I have a TH400. :)I guess I got lucky with the electronic S10 cluster that was smoking🔥flying down the off ramp to straight into Escondido Auto Electric 😲
Great stories. Useful information! Where? On vanning.com