I have a 2002 f350 psd 4x4 with 3.73 gears and 35" bfg's.I want to swap gears from 3.73 to 4.56 because of the tires. This should put my gear ratio around 4.06.I need to swap gears because I just purchased a 32 fiver toy hauler,with trailer loaded it should be around 10500#. Has anyone done this, is this the right gear ratio or should I try and get closer to 3.73 again?.Thanks Greg.

 

I think you're making a good choice to end up around 4.10 with that load.