Nothing wrong with the upgrade, but my question is the speedometer. has or is anyone having a speed problem. When running 60 MPH I am actually going 51 MPH. The dealer has tried multiple changes to the module but no avail. They were able to re cal the gas gauge to meet my upgraded 50 gal Titan tank....the OEM 28 gal was useless. I also added a Firestone air bag upgrade to take the sag out of the *** end....more so when my car trailer was hooked up. I thought with a 250 there would NO sag at any point less than 1-ton weight......WRONG.
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