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I am running 37" tires. I was able to get the dealer service shop to re program the parameters for tire pressure, howerver, they would not re calibrate the spedo. They claimed it violated some law.

15 f350. 6" lift and 37" Nitto tires = 86" tall to the highest rib of the roof. (No cab lights) Hope that helps

I had a speedo re calibrator installed when I did the lift/wheels/tires. It seriously confused the truck. As a result the speedo was 10 mph slower and the truck drove like it was in regen. I removed the device the next day. I have 37" tires and the speedo matches road side speed limit signs With...

A tech from the dealership has to reset the parameters for tire pressure. I just had this done on my last service. 2015 F350. I tried to get them to re calibrate my speedo. They told me it was ilegal and they wouldnt/couldn't do it.