new dually

Lower gear (higher engine speed per vehicle speed) is higher numerically in axle ratios.
When just "higher gear" or "lower gear" is written, it is not always clear what is meant without sorting out the context.
Young readers, nubies, and those learning English as a second language might appreciate better clearification?

3.73 in my 6.2 Gas F350 with 5,000 lbs in the bed does just fine. I think I could hold 6th better with 4.30's, but that's the only advantage I could see. With 6 gears it's pretty irrelevant.

I do drive the truck a lot lightly loaded without the TC on, and for that I definitely appreciate the 3.73's.

Ford doesn't offer 4.10's, but that would probably be the ideal gear ratio in my situation.

deltabravo wrote:

Kayteg1 wrote:
The only issue is that with low differential and 2WD your low gear might be too high, but with 4WD you will have transfer case changing gearing.

Transfer case doesn't change gearing in normal operation. 4LO does change it, but you sure can't be running around in that towing something on the highway.

This is actually what I have been doing with my F250 while pulling 18,000lb trailer over the mountain.
It had vacuum or manually operated hubs. The vacuum tubings were constant headache, so I cap them off and unless I manually engaged hubs, I had RWD with low gears by switching the selector on dashboard.
I had to stop the truck for it, what was the only inconvenience.

KD4UPL wrote:
I'm quite certain the OP meant 3.73. It's called a typo.
OP, are you getting the diesel? If so the 3.73 is your only option, you can't have the 4.10. It's been this way with GM since 2001.
If your getting a gas rig I would get the 4:10. I have a 2015 Chevy 3500 work truck with the 6.0 and 4.10. It weighs about 9,000 pounds most of the time. I wouldn't want a higher gear ration. If anything it needs lower.

Ha wasn't sure all DA trucks were still 3.73 only. Well then there's the options!
3.73, 3.73 or 3.73s. Pick one lol!

bigfootgrey wrote:
Our powerstroke dually has 3.73's. No issues at all carrying a 10.4 Bigfoot. Never towed with the camper on but I don't feel it would be a problem.
Bob

I have the same truck, it tows my loaded 7000 pound horse trailer with my 4500 pound Lance in the bed over mt passes with ease.

If you are buying a 6 liter gas engine then 4.10 is the way to go.

Our powerstroke dually has 3.73's. No issues at all carrying a 10.4 Bigfoot. Never towed with the camper on but I don't feel it would be a problem.
Bob

Kayteg1 wrote:
The only issue is that with low differential and 2WD your low gear might be too high, but with 4WD you will have transfer case changing gearing.

Transfer case doesn't change gearing in normal operation. 4LO does change it, but you sure can't be running around in that towing something on the highway.

Pages 14-16 of This document show 3.73 as the only gearing available with the D/A

4:10s for the Duramax?

Previously, the D/A combo was only 3.73, like mentioned earlier, dating back to the introduction of the Duramax, with the 2001 model year.

I've towed 10,000 lbs with my 09, while hauling the camper and never felt the need for lower gearing.