I just had a 4.10 gearset installed in my 2001 GT and I was all set to buy the Dallas Mustang Speedcal when I came across this product called SPEEDO RECALIBRATOR (made by ford) on gefracing.com. I tried a search on the forums here but didn't come up with much. Anyone using this product? I called gefracing and the guy told me it automatically calibrates whatever changes I have made to my car. I know with the speedcal, there are dip switches that need to be set depending on what gears the car originally had, and what the new gears are. I like that it's made by Ford, and the harness seems to plug right into the trans. Should I try this or just stick with the speedcal?
I would too. A calibrator made by Ford themselves. Sounds go to me. 