DD13 vs DD15 might even think Dd16

So DD13 470hp 1650tq vs DD15 505 1750tq engine rates. Hauling dump trailer running around 100,000lbs most of the time. Ordering it with the allison auto, it is $1200 more for the DD15 and will we really see it run that much better? Only plus I can see is a stronger engine brake. We can get tge dd16 rated at 560hp 1850tq for $2800 more but I think we will be burning even more fuel for nothing. If we go with the dd13 I will order it as a western star 4800SB if we go bigger the 4900SB.


What are your thoughts and why?

 

We do pull a lot of good size hills so getting heat shouldn't be a problem. Like the idea of the fuel economy with the DD13 but we have one with the maxforce 13l rated for 475hp and it is a turd for pulling. Only has 43k miles and is a year old and we are looking to spec this truck to replace that. .

 

Dd 15 is not rated for 1850. It is only rate for 1650/1750tq

If you look you will see the 1750 is not even for your first couple gears.

 

So any one else run these motors?

 

What's it rated for and how is the power and engine brake?