Used TMC truck

[Nostalgic]

I'd like to have 3.36's or 3.25's when I'm on flat ground empty and want to run 80 - I have yet to find a place I could make a living with in that geography all of the time. For any amount of hills or mountains, everyone is right 3.55 is about as tall as you want.

Of course, if you buy a new truck every 3 years and don't care about the engine, 3.36's and high torque will get you 2 points better fuel economy than me at a higher average speed. My IFTA MPG is 2nd highest in the fleet. I would not want to own the truck beating me by those 2 points in another 250k miles.