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 > Super duty 10 speed gear ratios

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Alberta

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Posted: 12/14/19 10:57am Link  |  Quote  |  Print  |  Notify Moderator

Very similar to the 1/2 ton ratios. They are probably all excellent but my personal preference is that they would have left reverse as a higher speed. I think it was 1:-3.4 in the 6 speed

Super Duty
Gear Ratios
First 4.615:1
Second 2.919:1
Third 2.132:1
Fourth 1.773:1
Fifth 1.519:1
Sixth 1.277:1
Seventh 1:01
Eigth 0.851:1
Ninth 0.687:1
Tenth 0.632:1
Reverse -4.695:1

GM/Ford 10r80
1st 4.6957:1
2nd 2.9851:1
3rd 2.1462:1
4th 1.7690:1
5th 1.5201:1
6th 1.2700:1
7th 1.0000:1
8th 0.8536:1
9th 0.6892;1
10th 0.6357:1
Reverse - 4.8661:1


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blt2ski

Kirkland, Wa

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Posted: 12/14/19 11:13am Link  |  Quote  |  Print  |  Notify Moderator

With the extreme low gears available, I can see a lockable reverse with two ratios depe ding on where you are driving at the time. A 4.x as shown first, for steeper grades, spongy off road environments that need more torque multiplication, then a taller 3.x for level hard surface environments.

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North jersey

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Posted: 12/14/19 11:29am Link  |  Quote  |  Print  |  Notify Moderator

Any reason for the different ratios between the two ten speeds? So similar, I can’t imagine much of a torque difference to justify the engineering and production variables.
Less than one percent difference between the two 10th ratios.


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North jersey

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Posted: 12/14/19 11:33am Link  |  Quote  |  Print  |  Notify Moderator

Assuming same tire size and axle ratios, 2000 RPM in top gear in one truck would give 2,011 RPM in the other at the same MPH.

theoldwizard1

SE MI

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Posted: 12/14/19 12:17pm Link  |  Quote  |  Print  |  Notify Moderator

Because of the design of the internal planets, carriers, etc, there is really very little opportunity to play with ratios. My guess was any changes were made to increase the "durability" of the transmission.

I am a bit surprised at the step between 1st and 2nd !

theoldwizard1

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Posted: 12/14/19 12:34pm Link  |  Quote  |  Print  |  Notify Moderator

Interesting !
[image]

Grit dog

Black Diamond, WA

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Posted: 12/14/19 12:58pm Link  |  Quote  |  Print  |  Notify Moderator

^Why is that interesting? Doesn't seem different than past gear offerings.


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Grit dog

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Posted: 12/14/19 01:03pm Link  |  Quote  |  Print  |  Notify Moderator

All I could afford wrote:

Any reason for the different ratios between the two ten speeds? So similar, I can’t imagine much of a torque difference to justify the engineering and production variables.
Less than one percent difference between the two 10th ratios.


Other than they're 2 completely different transmissions? 1 for 1/2 tons, 1 for HDs.

The fact that they're close to the same is becasue now there's so many gear splits, the transmissions now have both the high gear combos and low gear combos all wrapped into one. Where before with 4-6 speed units one still had to pick between a trans that was geared more for heavy pulling vs one that was geared better for bobtail duty.

In other words, there's only so many ways to slice a pie. If you slice it in 4 pieces, keeping with effective gear ratio theory, you can slice it many different ways and it will be acceptable. If you slice it 10 times, you need to be more selective where you choose to cut it, without screwing it up.

The slight differences in ratios are (assuming these are the best General gear splits) due to the resultant ratios achieved by the overall diameter and number of teeth on each gear.

* This post was edited 12/14/19 01:13pm by Grit dog *

Grit dog

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Posted: 12/14/19 01:11pm Link  |  Quote  |  Print  |  Notify Moderator

theoldwizard1 wrote:

Because of the design of the internal planets, carriers, etc, there is really very little opportunity to play with ratios. My guess was any changes were made to increase the "durability" of the transmission.

I am a bit surprised at the step between 1st and 2nd !


It's not surprising, it's normal if one understands gearing.
In short, if a gear ratio is doubled at say 10 mph, the result at the same rpm is 5 mph.
Double the ratio at 100mph and the result is 50 mph.
That's why a say 10% gear change at higher gears = a certain rpm change and a say 80% gear change at low gears = the same rpm change.

Notice the decrease in % ratio change in each step from low to high.

I'm beginning to understand why some folks think more gear ratios are "dumb" or unnecessary. It's becasue, based on some of these responses, they don't understand what's going on beyond, push skinny pedal = faster, release skinny pedal = slower.

mich800

Pontiac, MI

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Posted: 12/14/19 01:22pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

theoldwizard1 wrote:

Because of the design of the internal planets, carriers, etc, there is really very little opportunity to play with ratios. My guess was any changes were made to increase the "durability" of the transmission.

I am a bit surprised at the step between 1st and 2nd !


It's not surprising, it's normal if one understands gearing.
In short, if a gear ratio is doubled at say 10 mph, the result at the same rpm is 5 mph.
Double the ratio at 100mph and the result is 50 mph.
That's why a say 10% gear change at higher gears = a certain rpm change and a say 80% gear change at low gears = the same rpm change.

Notice the decrease in % ratio change in each step from low to high.

I'm beginning to understand why some folks think more gear ratios are "dumb" or unnecessary. It's becasue, based on some of these responses, they don't understand what's going on beyond, push skinny pedal = faster, release skinny pedal = slower.


Not the mention of the ability of second gear starts when the low first gear is not necessary.

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