IMHO, I would never consider going to 3.73.
It's a Diesel, makes massive torque, loves to eat down low, and you havesix6 gears to work with!
Heck, I would love to be able to have 3.23s if I could!
And I tow.
I made it a specific point to buy a truck with 3.55's after my prior experience with Cummins and Powerstroke trucks.
Remember, this is not a gasser; it's a diesel; let her eat!
Just an opinion from a new member, so I understand that it may not carry much weight, but I had a gazillion towing and empty miles on my old trusty P-pumped 2001 5.9L Cummins 24V with 3.55 gears and loved every minute of it.
If you tow heavy, drop a gear.
The low RPM cruise at 75 MPH is sweet if you are empty!
Kp
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