I have a 2021 F250 with 7.3L & 3:55 gearing. I tow a 7,500# TT and couldn't be happier with the setup. You'll gets lots of responses that "you should get the 4:30 gears". With the 10 speed trans, the 4:30 isn't needed unless you're towing the max or at least over 12,000#. The 20" wheels are a rougher ride than the 18" due to the 18" tires having larger sidewalls giving a softer ride.