speedometer after gear change

[slc]

I changed the rear axle ratio on my 1998 Blazer and now the speedometer is reading fast. I went from a 3:08 to a 3:42. The dealer said they can't recalibrate the ECM to correct the error. I tried four local dealers and got the same answer. Does anyone have any suggestions on how to correct the speedometer error? I know there are some performance programers that have the capability, but I don't realy want to go that route because of cost.

[More Power]

Yes, it is possible for you to alter your vehicle speed sensor buffer module to account for different gearing or tire sizes. The book we put together on the 6.5L Turbo Diesel (http://www.thedieselpage.com/65book.htm) covers this in detail plus a whole lot more.

Jim