3.73 vs 3.55 - Ford Powerstroke Diesel Forum
General 6.7 Discussion (2011-2016) General 6.7 Discussion

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post #1 of 7 Old 04-20-2019, 07:42 AM Thread Starter
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3.73 vs 3.55

I'm sure this has been covered several times, however searching has not satisfied my question. I currently have a 2015 with 3.73 and find that it seems to be perfect for me and what I do, pulling around 16k on a regular basis.

I've been looking at newer used trucks, 17+, and noticed a lot of them have 3.55. How big of a difference that will be?
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post #2 of 7 Old 04-20-2019, 08:00 AM
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With the 6.7, you won't notice the difference unless you lift the truck and put huge tires on it.

Larry

2015 F350 Ultra Lariat 6.7L CCLB DRW 3.73 Limited Slip, Green Gem Metallic w/ Caribou accent, Camper Package, Titan 65gal tank, Rapid Heat, Block Heater, Upfitter Switches, Dual Alternators, Cable Lock, Husky Floor Liners, Spray in Bedliner, 5th Wheel Prep, 25K 5th Wheel Hitch, Ford Goose Neck Hitch.

Traded 2011 F350 XLT CCLB SRW 6.2L gasser 6,000 miles for 2015

Sold 1996 F350 XLT CCLB DRW 7.3L 208,000 miles
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post #3 of 7 Old 04-20-2019, 11:59 AM
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I have a 2016 with 3.55... tow a 16k 5th wheel all the time. Plenty of power.
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post #4 of 7 Old 04-20-2019, 03:17 PM Thread Starter
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I didn't think there would be much difference, maybe a little lower RPM at highway speed? With the increase in HP between 15 and 17+ the low end is probably sufficient to get things rolling.
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post #5 of 7 Old 04-22-2019, 04:13 AM
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You won't see a difference at all because they're so close together. If you went from a 3.55 to 4.10 then yes you would.
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post #6 of 7 Old 04-28-2019, 04:25 PM
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Even with a lift and larger tires the 6.7 moves it with no problem in 3:55ís
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post #7 of 7 Old 04-29-2019, 04:35 AM
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I have a 12 F350 with 3.55 gears and I have a 2.5Ē leveling kit and run 35s and can haul or 5er no problem, donít think the difference will be noticeable.
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