looking to change my axle ratio

You honestly expect no contradictions? Shame on you

 

Lets look at this another way then.
Take a transmission, doesn't matter which one, and run it in direct. To pull 80,000lbs up a grade it will take more HP/torque to pull the hill at 40mph with 2.64's than it will with 3.55's.

If it is so efficient then why is it limited to 80,000?

 

What you haul isnt freight?

 

Because there is a different size gear in a 2.64 then a 3.55. The torqe to the wheels end up being the same. Different gear ratio, different torque change.

 

Oversize/overweight is not classed as being a freight hauler, open your ears a little you may learn something.
As a freebie though....freight haulers have doors, or have that mentality, Kind of like when you were at Landstar before they fired you for your driving and 2 accidents. Unfortunately, this mentality has crossed over into flatbed and step decks somewhat too, as is all too evident with the "class" of freight hauling flatbedders out there these days. Still I would rather park next to an open trailer for the most part, instead of a freight hauler, but the risk is gradually getting worse.
There are of course exceptions to every rule, but both times I have been hit while parked, it was by freight haulers. Most of the trucks I see in ditches, are freight haulers. Most of the trucks shut down at the scales are, you guessed it....The only bad securement I see on open trailers 90% of the time, is on a flat. Normally some freight hauler that wanted to "work his way up", driving for a big company. Can't remember the last time I saw bad or unsafe securement on a RGN or multi axle.
Now flame on........The stats speak for themselves, and I dont care

Martin

 

Hence the reasoning for the difference in the numbers, thanks for pointing that out though.

Not under identical conditions its not. (ie:the input power/torque)

Huh?

 

You would never run both rears with the same trans gearing. You run a 3.55 in direct you dont have enough speed. You run a 2.64 in OD you have to much speed. If you got a hill that you could stay in top gear, a 3.55 in OD wont use less hp/torque then a 2.64 in dirrect. You would never compare dirrect to dirrect. it makes no sense. To go the same speed as an 3.55 in direct, the 2.64 would be running in one of the underdrive gears.

because no one makes and 13/18 speed trans with a direct final gear. If you had a low enough first you could compensate for the rear end and still have a trans designed for direct.

now a 2.64 is similar to a 3.55. To spec heavy haul where you use 4.1 normally, you might need a taller ratio then 2.64, but you could still find a ratio to run dirrect with. But this taller ratio is just so you can get off the line. Its not needed once your int he ideal rpm range for 1st.

 

And that's your problem, you're only thinking this in a one-dimensional context. You also don't understand HP or Torque. This is an important statement for you to understand:

It takes the EXACT same horsepower ***at the wheels*** to pull a load up a hill at a certain speed. #### the gearing. Gears and differentials don't multiply horsepower. They only rob it. A direct drive setup robs less of it.

Torque on the driveline. It is spinning slower, yet the engine is making the same HP, therefore the torque must be higher.

 

Define freght....now define hauler. We all haul freght. I drive flatbed, that doesnt mean i don't haul freght. No need to disrespect van drivers.

 

Aren't y'all dizzy yet? Just relax, our freight hauling extraordinare will soon be departing the fishbowl of TTR to adjust his six transistor radio in search of his aforementioned hero. Meanwhile, those of us who are uneducated old school and unwilling to learn will keep earning the way its been done for the last 60+ years -by actually going out and doing it.