3:42 rears

Torque hitting the tire is the same, how about torque hitting the ground...?

 

Kenworth salesperson ... that I trust.

 

The lever is at the ring gear and not the tire tho
The force being exerted at the tire to pavement does not change with tire size.
Tire patch not withstanding,

 

I ask the question again,
What do the numbers mean and how does tire height change that.

And that salesman is confusing overall ratio and gear ratio.
they are completely different things.
Actual gear ratio affects torque
Overall ratio does not.

 

The linear force to the road is calculated by the torque applied at the axle divided by the radius of the wheel. Therefore the linear torque applied to the road will be increased by a smaller tire radius.
The wheel is a rotational lever acting on the ground as much as the piston rod acts on the crankshaft only in reverse.

 

I failed algebra.... so I’m out........

But putting 22.5 on that truck is the same a going to 3.55 or maybe 3.70 rear gear.

But what do I know ... I smoked to much weed in school

 

Lets do an experiment. Jack up the rear end so the tires are off the ground, Put a torque wrench on the wheel to measure the ''twist'' measure it with a 20 in tire and a 40 in tire the torque will be the same.
Now change the rear gear from 2.0 gear to a 4.0 gear the torque will change dramatically.

Sorry not buying that.
And nobody has answered the ? I posed yet.

 

But what would a chassis dyno or better yet seat of the pants tell you......

 

You're going to have more torque to the ground with a smaller tire, chief.

 

I'm with cat on this. The seat of the pants dyno you'll notice the difference. Take 3.91 like the 93 has on 295/22.5 and 4.42 on 11R24.5 on the 99.

Both are almost exactly same rpm at 65 (1600 and 1650)

Transmission Ratio RPM Calculator | Spicer Parts

3.91
40in tire
1600 rpm
.73
66.7 mph

4.42
44in tire
1600rpm
.73
64.94 mph

Now in the big .62od
3.91
40
1600
.62
=78.5mph at 1600.

Triple digit on small rubber