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Using a lower gear adds torque. Its like downshifting but not as great. At the same speed the RPM will be slightly higher. This is not about punching it from a stand still. It is about having a little more power available for the rolling hills or towing.
I read a 4.30 is an option for the F450.
Keep in mind we operate at/near maximum limits all the time.
I found these numbers:
55MPH
4.10 gear (stock) - 3rd gear 2586 rpm
4.30 gear - 3rd gear 2712 rpm
70mph
4.10 gear (stock) - 4th gear 2337 rpm
4.30 gear - 4th gear 2451 rpm
70mph
4.10 gear (stock) - 5th gear 1810 rpm
4.30 gear - 5th gear 1898 rpm
I wonder for you that have a E450 and carry a bigger weight load do you have the 4.30 differential?
The effective change to torque is an increase applied to the ground of 4.8%
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