Axle Gear Ratios
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8th Gear
Joined: Jul 2023
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From: San Angelo
Axle Gear Ratios
Looking at purchasing a used 2020 F250 Lariat with 3.31 Axle. I currently have a 2011 F250 King Ranch with 3.73 Axle. My question is what Axle is best for towing and mileage with the newer 10sp Super Dutys? I see some with 3.55 also. I currently have a 36ft 5th wheel that weights around 11k loaded. Thanks
Last edited by 68$hevellE; Aug 9, 2023 at 01:36 PM.
Cargo Master
Joined: Jan 2004
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From: Minnesota
Hmmmmmmm. I'm not sure Ford makes a 3.43.
The best towing axle is the biggest number IMO.
Just towed my 11.5K 5er 2K miles to Cody and back. Running 4.30's. Can't imagine towing 11.5K with anything else.
8.8 mpg out and 8.5 mpg back. More 70 mph and more wind on the way back.
The best towing axle is the biggest number IMO.
Just towed my 11.5K 5er 2K miles to Cody and back. Running 4.30's. Can't imagine towing 11.5K with anything else.
8.8 mpg out and 8.5 mpg back. More 70 mph and more wind on the way back.
Cargo Master
Joined: Apr 2021
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From: NW Wyoming USA
Let the axles ratio SHXX STORM thread begin!
Lead Driver
Joined: Nov 2005
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Looking at purchasing a used 2020 F250 Lariat with 3.43 Axle. I currently have a 2011 F250 King Ranch with 3.73 Axle. My question is what Axle is best for towing and mileage with the newer 10sp Super Dutys? I see some with 3.55 also. I currently have a 36ft 5th wheel that weights around 11k loaded. Thanks
There is no 3.43 ratio.
Ford never offered anything but 3.31, 3.55, 3.73 or 4.30 ratios in Super Duty trucks, and only certain of those ratios with certain engines.
So, we need more info on the truck combo you are looking at.
But, most any would tow a 11K 5th wheel.
Thread Starter
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8th Gear
Joined: Jul 2023
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From: San Angelo
My bad, you are correct, it is a 3.31 and its the 6.7l not a gasser, thanks for pointing that out, I corrected.
Last edited by 68$hevellE; Aug 9, 2023 at 01:42 PM.
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Logistics Pro
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3.31 in a diesel F250 will tow 11k lb 5th wheel just fine if my 95 460 can tow that much and it is rated for less than some half tons today.
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Lead Driver
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I've pulled 14K actual weight trailers with my 2022 F250 6.7 3.31, no issue what so ever.
Tuned
Joined: Dec 2021
Posts: 429
Likes: 126
Happy with 6.7L / 3.55 11.4k RV
I've had both the '20 & '22 F-350 6.7L SCLB with the 11.5k GVWR & 11.4k GVWR respectively, both with 3.55:1 and they both tow spectacularly. Unloaded mpg is 20+ @ 55mph with brush guard, front hitch, Tremor front panel and 275/65R20 Michelin All Terain 10 ply at 67 psi cold.
Towing 11.4k lbs easily @ 70mph is 11-13mpg due to 12.5'x8.5' frontal area of my RV and variations of terrain. The towing mpg improves at 55mph due to reduced wind resistance. Flat roads, good fuel and 50mph to 60mph gives close to 15mpg towing the same rig. I'm older and drive conservatively mostly.
We don't buy SD trucks for their mpg, really. We buy them to do work and haul heavy loads. They do that well. It's hard to beat the 6.7L/10-speed for towing.
Towing 11.4k lbs easily @ 70mph is 11-13mpg due to 12.5'x8.5' frontal area of my RV and variations of terrain. The towing mpg improves at 55mph due to reduced wind resistance. Flat roads, good fuel and 50mph to 60mph gives close to 15mpg towing the same rig. I'm older and drive conservatively mostly.
We don't buy SD trucks for their mpg, really. We buy them to do work and haul heavy loads. They do that well. It's hard to beat the 6.7L/10-speed for towing.
Tuned
Joined: Jun 2020
Posts: 435
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2018 250 6.7 w/ 3.31 and 6 speed tows my 14k fiver no issues from Ohio to Ocean City Md.
2022 350 DRW w/ 3.55 and 10 speed tows buttery smooth with all those gears. if 3.31 was an option I would have gone that route because first gear wants to pull an entire house!
2022 350 DRW w/ 3.55 and 10 speed tows buttery smooth with all those gears. if 3.31 was an option I would have gone that route because first gear wants to pull an entire house!
Tuned
Joined: Oct 2009
Posts: 417
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From: South Texas
Gear ratios always opens a can of worms. I add my experience. I had a 2015 F250 6.7 L with 3.55. Normal driving I got about 13 MPG. Put a 10k Fitth wheel on it miles were 9.5 to 10.5. Traded for a F350 DRW 6.7 L with 4.10 gears and 10 speed. Current milage Mosty town is 13.5-14. and 10 to 11 with trailer.