I have a 2013 SCREW 4x4 with the 5.0 / 3.55 / 9.75 rear end with electronic locker.

I am wanting to swap gears for towing purposes. I tow a 7300# TT fully loaded.

I want to swap to 3.73's or 4.10's

Here are my ?'s:
1) Will my speedometer or shift points be off after the gear Swap?

2) The differential shop says that in 2013 models that the computer will automatically adjust... is this true?

3) If I go with 3.73's (and the comp needs adjustment) can the Ford dealer load the map?

4) If I go with a custom map from a tuner shop will it screw up my transmission's towing features?

Thanks in advance for the help.


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