Lift Gearing?
Cargo Master
Joined: Aug 2003
Posts: 2,332
Likes: 442
From: Eastern Washington
what engine?
Diesels are a bit more forgiving and all the engines will turn the tires, but they'll appreciate gears.
After poking around on big meats, you'll really like the feeling of regearing. I ran 4.88 w/ v-10 and 38's, you might get a little more mileage w/ 4.56's. Powerstroke would probably like some 4.11's.
Diesels are a bit more forgiving and all the engines will turn the tires, but they'll appreciate gears.
After poking around on big meats, you'll really like the feeling of regearing. I ran 4.88 w/ v-10 and 38's, you might get a little more mileage w/ 4.56's. Powerstroke would probably like some 4.11's.
Post Fiend
Joined: Dec 2002
Posts: 6,245
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From: IL, USA
4.56s on a PSD would be for a 38" or 40" tire. I've ran both sizes with my 4.56s.
For a 37" tire I'd do a 4.30
For a 35" tire, I honestly wouldn't even regear unless you tow heavy and then I'd do 4.10s.
For a 37" tire I'd do a 4.30
For a 35" tire, I honestly wouldn't even regear unless you tow heavy and then I'd do 4.10s.
Senior User
Joined: Jul 2007
Posts: 186
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From: Orangevale, CA
I have 37's and I am going with the 4.56's Just because 1. I tow ALOT 2. I like to jump off the line 3. I drive like an old lady on the freeway 65-70 tops. Should put me around 1850 on the rpms.
Elder User
Joined: Feb 2003
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From: missoula montana
Originally Posted by pf350
I have 37's and I am going with the 4.56's Just because 1. I tow ALOT 2. I like to jump off the line 3. I drive like an old lady on the freeway 65-70 tops. Should put me around 1850 on the rpms.
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Senior User
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From: Orangevale, CA
Originally Posted by mtgrzlyman
i have 430s on 37s and my rpms are 2000 at 70mph and she pulls great still in od pulling 12000lbs of toys
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Brett Foote
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From: Stephensville WI
Here's another way to look at it.
Say you had 33 inch tires and went to 37 inch tires - you have 3.73 gears. You just changed your effective gearing to 3.32. You would need a 4.10 gear ratio JUST to get close to the stock effective ratio.
https://www.ford-trucks.com/calculat.../p-tire_sizes/
Say you had 33 inch tires and went to 37 inch tires - you have 3.73 gears. You just changed your effective gearing to 3.32. You would need a 4.10 gear ratio JUST to get close to the stock effective ratio.
https://www.ford-trucks.com/calculat.../p-tire_sizes/
Post Fiend
Joined: Dec 2002
Posts: 6,245
Likes: 1
From: IL, USA
Here's a chart I made that shows how tire size and gear choice effect rpms:
http://www.FTEs diesel forums.com/fo...ead.php?t=2896
http://www.FTEs diesel forums.com/fo...ead.php?t=2896
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