10spd direct with 2.64 Rears, ok for hills/grades?
I have found a used truck with an ISX, 10spd direct and 2.64 rears. I know this is a good setup for fuel economy, but I am unsure on how this will perform on grades and hills? I currently run an 18spd with 3.36's behind a CAT. I understand that going to the direct will be a bit different. I haul very close to 80,000lbs and run the Western States. Anyone have experience with this setup?
Is this a good question?