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Open Roads Forum  >  Tow Vehicles

 > 4.10 rear in new Ford F350

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Grit dog

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Posted: 09/19/19 11:01pm Link  |  Quote  |  Print  |  Notify Moderator

^ Lol, right?
Methinks the OP doesn’t know there’s a difference.
In short. Gasser, if towing anything significant, get the deepest gears you can for the best performance. Diesel has 2x+ the torque of the gasser so you can tow pretty heavy with taller gears easily.


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spud1957

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Posted: 09/20/19 03:22am Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

Gas or diesel and towing what?


4:10s are only available in the DRW diesel in the 350. Need to step up to the 450 to get 4:30s. And the 450 only comes with the diesel.

4:30s only in the gasser.

4x4ord

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Posted: 09/20/19 04:44am Link  |  Quote  |  Print  |  Notify Moderator

The differeonce in 60mph high gear cruising rpm between 3.55 and 4.10 is 1524 rpm vs 1760 rpm. The power required to tow a 16k 5ver at 60 mph on level ground is only about 100 hp. The 6.7 can produce 320 hp at 1800 rpm. When peak hp is needed in the hills the 4.10 rear gears will have the transmission in 5th and the engine running 2260 rpm at 60 mph. The 3.55 gears would put the transmission in 4th gear with the engine running 2616 rpm. So the 3.55 gears are going to out pull the 4.10 gears on hills that the truck is capable of climbing at 60 mph. It takes a pretty steep hill or a very heavy trailer before the 4.10 gears offer the advantage.


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Huntindog

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Posted: 09/20/19 04:58am Link  |  Quote  |  Print  |  Notify Moderator

4x4ord wrote:

The differeonce in 60mph high gear cruising rpm between 3.55 and 4.10 is 1524 rpm vs 1760 rpm. The power required to tow a 16k 5ver at 60 mph on level ground is only about 100 hp. The 6.7 can produce 320 hp at 1800 rpm. When peak hp is needed in the hills the 4.10 rear gears will have the transmission in 5th and the engine running 2260 rpm at 60 mph. The 3.55 gears would put the transmission in 4th gear with the engine running 2616 rpm. So the 3.55 gears are going to out pull the 4.10 gears on hills that the truck is capable of climbing at 60 mph. It takes a pretty steep hill or a very heavy trailer before the 4.10 gears offer the advantage.
Ummm. Fords max specs need the 4.10s. OP doesn't state what he will be towing. Just that he will have a 5500# camper, AND towing something occasionally.. He may be pushing that truck pretty hard.


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dodge guy

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Posted: 09/20/19 06:02am Link  |  Quote  |  Print  |  Notify Moderator

Huntindog wrote:

4x4ord wrote:

The differeonce in 60mph high gear cruising rpm between 3.55 and 4.10 is 1524 rpm vs 1760 rpm. The power required to tow a 16k 5ver at 60 mph on level ground is only about 100 hp. The 6.7 can produce 320 hp at 1800 rpm. When peak hp is needed in the hills the 4.10 rear gears will have the transmission in 5th and the engine running 2260 rpm at 60 mph. The 3.55 gears would put the transmission in 4th gear with the engine running 2616 rpm. So the 3.55 gears are going to out pull the 4.10 gears on hills that the truck is capable of climbing at 60 mph. It takes a pretty steep hill or a very heavy trailer before the 4.10 gears offer the advantage.
Ummm. Fords max specs need the 4.10s. OP doesn't state what he will be towing. Just that he will have a 5500# camper, AND towing something occasionally.. He may be pushing that truck pretty hard.


Yep Exactly! The 4.10's are the way to go. It'll walk right past a similarly loaded 3.73 truck.


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Vanished

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Posted: 09/20/19 06:39am Link  |  Quote  |  Print  |  Notify Moderator

We have a new '19 F350 diesel DRW w/ 4.10's - 15k trailer and 2k trip averaged about 11 mpg...


2019 Ford F350 4x4 diesel DRW

Grit dog

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Posted: 09/20/19 09:59am Link  |  Quote  |  Print  |  Notify Moderator

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??

dennych1

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Posted: 09/20/19 03:17pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for all this info while researching new truck

Me Again

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Posted: 09/20/19 05:25pm Link  |  Quote  |  Print  |  Notify Moderator

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!


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Lynnmor

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Posted: 09/20/19 05:59pm Link  |  Quote  |  Print  |  Notify Moderator

Me Again wrote:

. What you think you gain with the lower diff gears in negated by the steeper OD ratio. Think final gear ratio!


Keep in mind that the transmission is worked harder with higher diff gears.

You multiply the top gear ratio times the diff gear ratio, and the result is always more torque with the lower rear gears. Add to that, each gear change is less of a difference in road speed, keeping the engine at a better RPM.





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