Super duty 10 speed gear ratios
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 Dut...
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Me Again wrote:Huntindog wrote:4x4ord wrote:It is even worse than you state. In 2015, all of the big three limited TQ in at least 1st gear to protect the rear end. A 3.31 is stronger than a 4.30. GM has publicly stated that full power is now available in every gear.
An interesting point when looking at the 10 speed in a new F350 vs the 6 speed in a 2015 model is this:
The max rear wheel torque at 1600 engine rpm in low gear (disregarding parasitic losses) in 2020 with 3.31 final gears is:
1050 x 4.615 x 3.31 or 16,039 lb ft.
In 2015 the max torque of the f450 with 4.30 final drive in low gear was:
860 x 3.97 x 4.30 or 14,681 lb ft.
I haven't heard about the others yet.
That thing about diff gear would apply to the 4.615 and 3.97 tranny gears, with the 3.97 being stronger that the 4.615?
I don't know about the trannys.
The diff is the last piece in the driveline, so it has to stand up to the multiplication that has occured in the tranny and convertor. The deal with taller R & P being stronger is that as one goes lower the contact between the R & P gets smaller and weaker.
