The 5speed tranny is standard equipment - they do not say what the ratios are for the 5 speeds however they are comparing them to some competitors 4speed with 3.73 and 4.10 rear ends. Most of the big three use an OD around .7:1 so a 3.73 rear end results in a final drive of 2.6 and with the 4.10 it is 2.87. Since they made the comparison, it points out that their 5th gear produces similar results. Using reverse math, the 5th gear in the Nissan comes out around 1:1. I don't which tranny Nissan made their comparisons on - Ford, GM, or Dodge.
The standard rear end is a 2.94
The Tow Pkg rear end is a 3.357
As for the tow/haul mode I suspect it acts like most of them - it simply alters the shift pattern so the engine revs higher before shifting. There is not much about it ont the web site.
07 Chevy 2500HD 6.0L ,6 speed auto, 4x4, Blue Granite Metalic
05 Arctic Fox 22H