I am thinking of going from a 411 to a 308 or 336 rear. I like to keep up with the speed limit.
I was thinking of going to a 264 but according to road ranger calculator I would half to be running over 100 mph to get into tenth gear.
I am looking for fuel savings. Does anyone have any idea what saving it would be or if it would be worth the expense.
Thanks for any input
Gear Ratio change for fuel savings.
Discussion in 'Car Hauler and Auto Carrier Trucking Forum' started by bmercer, Jul 13, 2017.
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Need a LOT more info to even know if its feasible, how much weight do you run at, where do you run, how big a motor you got, is your tranny a direct or over, how tall a tire are you running????? There is a lot to consider other than just grabbing a gear ratio out of the air, you could go to a taller gear and kill your mileage if it works the motor all the time!!!brian991219, OLDSKOOLERnWV, Terry270 and 3 others Thank this. -
Fuel mileage was the same because I think the engine was working the same even at the lower revs. My thought is a big hp engine that is barely breaking a sweat at 75 mph will get better mileage then a smaller one that's balls to the wall at 65 mph. -
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I run something very seldom used but recommended by some performance diesel builders. 18 speed with a 2:64. I did it so I can run in direct drive(16) when I am going less than 64. This is the most efficient gear with a one to one ratio meaning less parasitic loss. 17 which is a single overdrive when I need to run. 18 is only to show off which we all know I never would do at this age!
Walmart uses 2:64 in 10 speeds for fuel mileage with 22.5 tires at 65.brian991219 and bmercer Thank this. -
I just now remembered that my Jack Cooper rig was a 2:64 10 speed with 19.5 tires and was a hard puller.
bmercer Thanks this. -
475 hp @ 1700 rpm,
1700 lb-ft torque @ 1000 rpm
24.5" tires
.73 final drive ratio per international shop. Not direct.
I will probably gross 60 to 65 k fully loaded.
It's a 2012 Prostar weighing 18200 full of fuel.
I'm looking at purchasing a sun country 5 car which is around 17 k with everything.
I will run all lower 48 but mostly central and southern US.
The truck at 1600 rpm pulling heavy is running at 65 mph and only getting 4.5 mpg.KANSAS TRANSIT Thanks this. -
Well 411 is a deep gear but 24.5 is tall rubber, could be worse,
Your truck weighs in at 18,200 and your trailer is 17,000 so you are at 35,000 empty, lets say your load mix is two trucks and three cars ( big load on that trailer but possible) if the trucks are 6500 and the cars are 4000 each you are looking at around 25,000 in cargo so you are only going to be around 60,000 or less most days.
You could probably go as low as a 3.08 with no issue with your tall rubber I personally would not drop below that if you are running all 48.
I know you don't want to hear this, but if that Pro Star has a MF in it, I am afraid your gear ratio is going to be the least of your issues, if you already own that truck, I would run it just the way it is and see if it is reliable before I stuck any money into it.
Don't shoot the messenger, we leased a 2013 Pro Star MF to run a 7/8 car, it was gutless, and it had 342 on 22.5'sbrian991219 and bmercer Thank this. -
There's no way I would go under 3.55 but that's just my opinion. Hell with the tall rubber 3.70s would work well. That's what my Volvo midroof has and it averaged 7.4mpg for over 100k miles pulling a Miller 7 car
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bmercer Thanks this.
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