Originally Posted by Adony
My previous tow vehicle was a 2002 F-250 / 5.4 that had a 3.73 rear end. We tow a 28 ft TT (6800 lbs EMPTY).. That truck was wrecked and the replacement truck is a 2006 F-250 / 5.4 but has a 4.10 (code 4n) differential. I seldom tow above 60/65 mph so will I notice much of a difference? Power? MILEAGE? Never thought to inquire about differential ratio until after purchasing the replacement truck....Opps!
You probably wont notice much.
You could step up one size tire, and that would almost equal it out.
I went from 32" tires with 3.21 gears to 35" tires and 4.10.
Tach is 200 rpm from stock.