4.10 rear in new Ford F350
A lot of leftovers have the 4.10 rear any one know if there would be a big difference in MPG towing or would it be negligible..?
Forum Discussion
Me Again wrote:Grit dog wrote:
And now we have the tall gears will out pull the low gears guys checking in.
Regardless of gas/diesel, number of trans gears, apples to apples, lower gears put more power to the ground.
I spose one could cherry pick one particular situation where the trans gears and torque curve of a particular vehicle might favor taller gears, but that will be a very select case.
Or all the mechanical engineers and theory are wrong......
Wonder why trucks with deeper gears generally are rated to tow more??
Back when trucks had 3 and 4 speed tranny's gear ratio really mattered. Now with 6-10 transmission we can look at final gear ratio based on the tranny gear in use.
Example the RAM with 3.42/Aisin in 5th has almost an identical final gear ratio was 4.10 truck in 6th gear.
The 4.10 truck in 6th is work against a .63 OD ratio while the 3.42 truck is in 5th working against a .77 OD ratio.
4.1 x 0.63=2.583
3.42 x 0.77=2.6334
Now add in the shorter tires on the dually with 4.10 and it is a wash. What you think you gain with the lower diff gears in negated by the steeper OD ratio. Think final gear ratio!
When the rear axle ratio changes it effectively changes each gear in the transmission. So with 4.10's each gear is more efficient. It's not just about cruising rpm, it's about efficiency.
