I was looking at a 2014 Ram 2500 with 6.4 Hemi the other day as a possible tow vehicle for my 5th wheel (9100lbs dry) so I looked up the tow ratings. With the standard axle ratio (3.73) the truck is rated to tow 3,000lbs LESS than if it had the 4.10 axle ratio. crew cab with 6'4" box 4x4. 12,580lbs with the 3.73 and 15,580lbs with the 4.10.Surprises me how much of a difference the axle ratio makes.

Yep, me too. My 5er is 37' long, has 3 slides, and weighs about 11500 to 12K loaded up. I am very happy with the way the Hemi pulls it.

We selected the middle ratio for us...The 4:10 give you most towing weights and least fuel mileageThe 3:73 gives the best of both worlds for towing weights and fuel mileage The 3:55 gives least towing weights and best fuel mileage.Those were the options I have on my 2010 FORD TRUCK. I notice the lowest 3:55 is not offered on the newer trucks now.Roy Ken

For 2015 Ford F150 they show 3:31, 3:55 and 3:73 ratios available with the 2.7, 3.5 and 5.0 engines.

I have the 5.7l and the difference is 2k lbs between the 3.73 and 4.10I have the 4.10 and while gas mileage is decent it really doesn't work very hard when pulling my TT

Just think of the rear gears as the final torque multiplier, the lower the gears the better the torque multiplication so you can pull more weight. Denny

Axle Ratio and tow rating | Good Sam Community

fx2tom
Explorer
Feb 24, 2015
I have the 5.7l and the difference is 2k lbs between the 3.73 and 4.10

I have the 4.10 and while gas mileage is decent it really doesn't work very hard when pulling my TT
rcmiller32
Explorer
Feb 24, 2015
For 2015 Ford F150 they show 3:31, 3:55 and 3:73 ratios available with the 2.7, 3.5 and 5.0 engines.
RoyB
Explorer II
Feb 24, 2015
We selected the middle ratio for us...

The 4:10 give you most towing weights and least fuel mileage
The 3:73 gives the best of both worlds for towing weights and fuel mileage
The 3:55 gives least towing weights and best fuel mileage.

Those were the options I have on my 2010 FORD TRUCK. I notice the lowest 3:55 is not offered on the newer trucks now.

Roy Ken
ib516
Explorer II
Feb 24, 2015
Yep, me too. My 5er is 37' long, has 3 slides, and weighs about 11500 to 12K loaded up. I am very happy with the way the Hemi pulls it.

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Axle Ratio and tow rating

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