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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?

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I run an 18spd with 2.64 rears. No problem on hills. I can walk right on up them with anyone else. I tackle some pretty stiff grades. Though they are shorter than some of the big hills out west, they are sometimes actually a little steeper. I run a lot of hill country in SE Ohio Amish country that has some interesting hills with 20 mph corners at the top and bottoms. Lots of shifting on those runs, and I have no problem. Most total weight in those situations are 75,000 -80,000 lb. Even have to tackle some gravel roads that have grades on them that would make a new driver's rearend pucker up to where you couldn't get a greased BB up it, with no more problem that when I used 3.55 and 3.70 rear ratios. A 10 direct has a lower bottom than an 18spd, so low end grunt is not a real problem. A 2.64 will not allow you to jackrabbit start from the light like a shorter ratio would, but for most of us, we don't use our trucks for trying to qualify for a NHRA event.

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you'll do as well up hills as the engine can. i went from 2.85 to 2.64 to drive faster and haven't noticed any difference on hills.

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When I drove a company truck it was not an issue. Pulled a reefer so usually heavy. I just wasnt impressed with the mercedes power.

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