Swap 4.10 for 3.73 gears? - Ford Powerstroke Diesel Forum
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Old 06-11-2013, 01:03 PM
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Swap 4.10 for 3.73 gears?

I have a 99 model 4x4 dually with 4.10 gears used to tow our travel trailer. Wife wants to take the truck on a 4000 mile trip this summer. Local guy has a set of front and rear low mileage 3.73 gears for sale.

Would it be worth the time and money to swap the gears for better MPG and lower RPM on highway? Do the 3.73 swap out easy into 4.10 housing?
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Old 06-11-2013, 04:15 PM
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The front is a direct swap.
I don't think the rears will though as the local guys gears are probably from a SRW truck and the dually uses a different rear end.

Buy bigger tires
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Old 06-11-2013, 04:32 PM
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your rear end is a Dana 80 the SRW trucks use a sterling 10.5 so the rear gears as stated above are not interchangeable
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Old 06-16-2013, 04:37 PM
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Unless you're doing this yourself, most of the cost is in labor. Don't cheap out with used gears. Also, if you're doing it for the fuel cost, youre going to have to drive a lot more than 4k miles to make up for the swap costs.

That being said, I'm swapping my 4.10's to 3.73's next time I have the rear apart. I just want the lower cruising rpm's mostly.
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Old 06-16-2013, 06:59 PM
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If all you use it for is towing, then don't swap. Maybe a taller tire.
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Old 06-16-2013, 07:15 PM
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If your pulling near maximum weight I would stick with the 4:10's sure its a ***** on the freeway but if you drive 60-65 it isnt bad. If your at max weight and going up any type of decent grade you will be thankful for any shorter gear you can get.
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Old 06-16-2013, 08:06 PM
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I wouldn't change them. Unless you're keeping stock tire size, 4.10 is what everyone else wants. 35's will drop RPM's, bringing it to ~stock engine speeds. Since it's a dually, narrow tires are required, so you mileage shouldn't be affect much by the height change. I would love to say it's better, but a stuck hub fudged my numbers.
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Old 06-16-2013, 09:59 PM
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255/85-16 is a tire match made in heaven for a dually if you're still running stock rims
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Old 06-17-2013, 05:05 PM
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....'cept 255's only seem to be available on a mud/offroad tread. Mine has 255's and I was going to stick with them but no one seems to have that size on a street/mild offroad tread anymore. Evidently they have been discontinued.
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Old 06-18-2013, 10:30 PM
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I know what you mean.
The only tire I know of that I would consider is the Toyo M55
I like that tire
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