Heavy-duty payload package
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New User
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Heavy-duty payload package
I have just purchased a 2018 F-150 Lariat, 3.5 L ecoboost with H-D payload pkg. which increased my GVWR to 7850 lbs., so I went from a 3.55 rear-axle to 3.73 and the gear set is now 9.75". My question is, how much will this affect fuel economy for both towing and normal driving?
5th Wheeling
Joined: Jan 2018
Posts: 27
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I have just purchased a 2018 F-150 Lariat, 3.5 L ecoboost with H-D payload pkg. which increased my GVWR to 7850 lbs., so I went from a 3.55 rear-axle to 3.73 and the gear set is now 9.75". My question is, how much will this affect fuel economy for both towing and normal driving?
Fleet Mechanic
Joined: Dec 2008
Posts: 1,911
Likes: 134
From: Burleson, Tx
With the 10 speed transmission you probably won't even notice it.
Here is a page that you can put in the gear ratios and it will show you the RPM for any given speed. It's less than 150rpm for the gear difference at 70mph in 7th gear and in 10th gear it is like 80rpm difference.
https://purperformance.com/p-29669-rpm-calculator.html
2nd 2.98 : 1
3rd 2.14 : 1
4th 1.76 : 1
5th 1.52 : 1
6th 1.27 : 1
7th 1.00 : 1
8th 0.85 : 1
9th 0.68 : 1
10th 0.63 : 1
R 4.86 : 1
Here is a page that you can put in the gear ratios and it will show you the RPM for any given speed. It's less than 150rpm for the gear difference at 70mph in 7th gear and in 10th gear it is like 80rpm difference.
https://purperformance.com/p-29669-rpm-calculator.html
FORD 10R80 10 SPEED GEAR RATIOS
1st 4.69 : 12nd 2.98 : 1
3rd 2.14 : 1
4th 1.76 : 1
5th 1.52 : 1
6th 1.27 : 1
7th 1.00 : 1
8th 0.85 : 1
9th 0.68 : 1
10th 0.63 : 1
R 4.86 : 1
Lead Driver
Joined: Jun 2005
Posts: 8,465
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From: Calgary Canada
+1, post a pic of the white and yellow sticker inside the drivers door, and while you are at it, pics of the rest of the truck too. We like pictures.
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New User
Joined: Mar 2009
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Thank you all for your input, it's more truck than I actually need for what I am hauling but I am more comfortable with too much truck than not enough, p.s. posting pics is out of my league but the door stickers confirm the increased GVWR of the truck.
5th Wheeling
Joined: Jan 2018
Posts: 27
Likes: 2
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