Super duty 10 speed gear ratios

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.

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

Interesting !

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 !

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.

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.

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.

Marty