Generally, the guys with trail rigs run a different gear, simply because of their odd mix and match of rear/front ends. They can go with a Yota rear, and a GM front, sometimes it gets hard to find a matching gear set.

The factory did it, simply because the gears were already being made. It was a cost benefit, I believe.

no real added benefit to it though, it just was another way to the same end.

 

Guys i use the truck for my daily driven, sometimes i go to the track and do a couple of drag racing 1/4, And i do highway miles too. My tire sizes are 305/70/17 on the future i am planning on going back to stock tires.