Problems with Speedo Calc. / PLEASE HELP

[Boost]

SUCCESS! Thanks to Paul's help, the speedo reads perfect now. At first I tried changing just H0135 (in addition to H0101 that was already changed before). This alone did not fix it, as we were showing 40 mph when actual speed was 32 mph. Then I flashed it with "plan B", in which I adjusted H0103 and H0122. I also changed H0103 in the tranny cal. This worked! We are now showing the right speed, it's perfect. Thanks so much for helping me fix this!

So the culprit was H0103 and / or H0122. Thanks !!!

[lb7diesel]

Can someone elaborate more on what to change to correct the speedo. My dad just put 3.90 gears in his silverado. I also used the speedo calculator to correct the speed. I entered the new gear ratio along with his tire size. I entered every new H # into the proper table and then saved. Nothing is correct still. It did stop the ABS light from coming on though..

I was going to try and divide 3.90/3.42 and then multiply that into the factory setting like Paul said, but I see that there is more to change. What else do I need to change?

[Boost]

Did you change H0103 in the TRANNY cal? I posted everything I changed that helped me, good luck!