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Old 03-07-2016, 03:27 PM   #1
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Different Truck / Different Rear End Ratio??

My previous tow vehicle was a 2002 F-250 / 5.4 that had a 3.73 rear end. We tow a 28 ft TT (6800 lbs EMPTY).. That truck was wrecked and the replacement truck is a 2006 F-250 / 5.4 but has a 4.10 (code 4n) differential. I seldom tow above 60/65 mph so will I notice much of a difference? Power? MILEAGE? Never thought to inquire about differential ratio until after purchasing the replacement truck....Opps!
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Old 03-07-2016, 03:55 PM   #2
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You didn't mention the transmissions in either truck so hard to say. All things being equal except for the gearing in the differential it may be just a bit less in the MPG department but a little easier in the pulling department.
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Old 03-07-2016, 04:07 PM   #3
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Quote:
Originally Posted by Adony View Post
My previous tow vehicle was a 2002 F-250 / 5.4 that had a 3.73 rear end. We tow a 28 ft TT (6800 lbs EMPTY).. That truck was wrecked and the replacement truck is a 2006 F-250 / 5.4 but has a 4.10 (code 4n) differential. I seldom tow above 60/65 mph so will I notice much of a difference? Power? MILEAGE? Never thought to inquire about differential ratio until after purchasing the replacement truck....Opps!
You probably wont notice much.

You could step up one size tire, and that would almost equal it out.

I went from 32" tires with 3.21 gears to 35" tires and 4.10.

Tach is 200 rpm from stock.
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Old 03-07-2016, 08:52 PM   #4
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Hard to compare those two trucks. One having the 2 valve engine and 4 speed and the new one having the 3 valve engine and a 5 speed. The 4.10 will give you 10% more RPM's at any speed. So if you were running 2000 RPM at 70 mph with the 3.73 then you would at 2200 RPM with the 4.10. The 4.10 also gives the truck a 2K increase in tow rating.


2010 F250 5.4L 3.73
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Old 03-08-2016, 11:26 AM   #5
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You will definitely have more power towing. As far as mpg, I will bet money you will be the same as far as mpg towing if not a little better.
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Old 03-08-2016, 02:59 PM   #6
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You will notice a difference. Take of from a stop is much beter as well as hills and passing. MPG will stay the same. The 3 valve engine is much better than your older 2 valve in both horsepower & torque.
Get some custom tunes from 5 Star Tuning & you will have a whole new towing animal of a truck!
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Old 03-12-2016, 09:44 AM   #7
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I replaced my 3.55 rear axle assembly with 3.90s on my '02 Ram 5.9l. Improved tow performance but no difference in MPG, RPM's didn't change that much either.
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