Gears to use????
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Junior User
Joined: Apr 2007
Posts: 68
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From: Sountern Indiana
Gears to use????
I own a f-250 with 7.3 turbo with a 5 speed and 4:10 gears
I do a lot of interstate driving and it only wants to run about 65 at 2250 rpms
I was wanting to change the gear ratio so I could run 70 or 75 at 2000 rpms I also skip over first gear and never use it even towing a 26 foot gooseneck hauling hay or tractors.
What gears should I use, 3:23 3:55 3:73???????????????
All comments welcome
I do a lot of interstate driving and it only wants to run about 65 at 2250 rpms
I was wanting to change the gear ratio so I could run 70 or 75 at 2000 rpms I also skip over first gear and never use it even towing a 26 foot gooseneck hauling hay or tractors.
What gears should I use, 3:23 3:55 3:73???????????????
All comments welcome
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
you really can't have both 70 MPH at 2k and never use 1st gear. if you don't want to use 1st stay with the gears you have. If you want 70 mph at 2k you need 3.55 gears. you might be able to find somebody who wants to swap gears with you.
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Posting Guru
Joined: Mar 2007
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From: hillsborough nj
or get bigger tires with 3.73's but then you're getting worse milage cause of more rotating mass....
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Senior User
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I have 35" tires and swapped from 4:10 to 3.55 last year. It is a great combo. RPM's are good even at highway speeds. I do have to grab 4th a little quicker on the hills but 4th is a lot more useable. If you have the crappy independant front like I do you may not be able to get 3.73's. The rears are available but not the fronts.
I sure would like to know how people get 20 MPG out of these trucks. Best I have EVER seen is 17 MPG. I think the math is flawed.
I sure would like to know how people get 20 MPG out of these trucks. Best I have EVER seen is 17 MPG. I think the math is flawed.
Junior User
Joined: Sep 2006
Posts: 73
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i have a 2wd 250 and i average around 16-18 in town and on the highway i get about 18.5 i am pretty sure i have 3.55s i run 2000 rpm at 66 mph. has anybody heard about OD units and what they do to final drive ratios?? i would really like to be able to run about 80 at 2000 but i dont really want to lose any of the gears i have. BTW imho you can start out in 2nd with these gears on anything but uphill and do just fine
Mountain Pass
Joined: Jan 2006
Posts: 241
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From: Woodleaf NC
Originally Posted by wfodickinson
I sure would like to know how people get 20 MPG out of these trucks. Best I have EVER seen is 17 MPG. I think the math is flawed.