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- #1,021
I changed the tire size on my F-150 Tremor and it was 0.5 mph off to the slow side, super happy with it. I was like that for two years. Had an over the air update and jacked the entire truck up. Ford had it for 6 months trying to figure out what was wrong. They didn't think any of the ForScan changes would affect anything. Replaced modules and refreshed everything. Only thing that fixed it was getting rid of the tire size change, DRL change and reprograming everything back to stock. It affected almost every system, even the ones not related the actual modules changed in ForScan. The engineer and programers both said they have had serious trouble fixing some of the programing issues caused by ForScan users. The ON/OFF changes are not part of the problem. But when you mess with the ranged values. Is the Superduty prone to this problem? I think I am going to skip the ForScan and do the module that goes behind the dash if the speed is to far off. I was 11% off going to 37;s on my F150. I had to change a few lines of code and reset the TCM and a few other things. Been so long I can't remember. It worked and the OTA jacked everything up.
