. You will probably lose about 1-2 mpg, though.
Gear recomendations???
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From: Ormond Beach
Gear recomendations???
Truck - 2004 Ford F250 4x4 SD
Engine - 5.4L automatic w/ Over drive
Stock gear ratio - 3.73
New tire size - 37 Super Swampers
Question. I am torn between going with 4.56's and 4.88's. 4.56's would put me back to almost stock and 4.88's would be like having a 4.10 stock rear end. I do more around town driving and pull a trailer 3 days a week. Occasionaly, about twice a month, I pull a 24 foot boat.
What gear ratio would you all use and why?
What about fuel consumption?
Thanks
Doug D
Engine - 5.4L automatic w/ Over drive
Stock gear ratio - 3.73
New tire size - 37 Super Swampers
Question. I am torn between going with 4.56's and 4.88's. 4.56's would put me back to almost stock and 4.88's would be like having a 4.10 stock rear end. I do more around town driving and pull a trailer 3 days a week. Occasionaly, about twice a month, I pull a 24 foot boat.
What gear ratio would you all use and why?
What about fuel consumption?
Thanks
Doug D
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Senior User
Joined: Feb 2004
Posts: 438
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From: Ormond Beach
Ha, ha---
Well the way the engine lugs now the milage couldn't be much worse. I average about 9.4mpg I would think that the 4.88's or the 4.56's would improve the milage...
Just a thought.
Well the way the engine lugs now the milage couldn't be much worse. I average about 9.4mpg I would think that the 4.88's or the 4.56's would improve the milage...
Just a thought.
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From: USA
I agree, go with the 4.88's, unless you are in the habit of driving 80+mph on the freeway. Your mileage while towing will probably be better with the 4.88's, plus more power. Unloaded mileage may be worse unless you slow down some.
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Originally Posted by DougD
Truck - 2004 Ford F250 4x4 SD
Engine - 5.4L automatic w/ Over drive
Stock gear ratio - 3.73
New tire size - 37 Super Swampers
Question. I am torn between going with 4.56's and 4.88's. 4.56's would put me back to almost stock and 4.88's would be like having a 4.10 stock rear end. I do more around town driving and pull a trailer 3 days a week. Occasionaly, about twice a month, I pull a 24 foot boat.
What gear ratio would you all use and why?
What about fuel consumption?
Thanks
Doug D
Engine - 5.4L automatic w/ Over drive
Stock gear ratio - 3.73
New tire size - 37 Super Swampers
Question. I am torn between going with 4.56's and 4.88's. 4.56's would put me back to almost stock and 4.88's would be like having a 4.10 stock rear end. I do more around town driving and pull a trailer 3 days a week. Occasionaly, about twice a month, I pull a 24 foot boat.
What gear ratio would you all use and why?
What about fuel consumption?
Thanks
Doug D
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Joined: Dec 2002
Posts: 3,959
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From: USA
265/75-16's are approx. 31.5" tall.
Using the formula: -------- NewGearRatio = (NewTireDia / OldTireDia) X OldGearRatio ------,
We can find the effect of different gear ratios and tire sizes and how they compare performance-wise with the stock ratio and stock size tires.
37 / 31.5 x 3.73 = 4.38. So 4.30's will get the effective ratio back to the stock 3.73 ratio.
For a 4.10 effective ratio, just plug in 4.10 for 3.73 in the same equation: 37 / 31.5 x 4.10 = 4.82. So 4.88's would be similar to a 4.10 ratio with stock tires.
If we plug in 3.90 for 3.73 in the equation: 37 / 31.5 x 3.90 = 4.58. So 4.56's would be similar to stock tires with a 3.90 ratio.
By the way, I run 4.56's with 33's on my gas-powered F350, for an approx 4.30 effective ratio
.
Using the formula: -------- NewGearRatio = (NewTireDia / OldTireDia) X OldGearRatio ------,
We can find the effect of different gear ratios and tire sizes and how they compare performance-wise with the stock ratio and stock size tires.
37 / 31.5 x 3.73 = 4.38. So 4.30's will get the effective ratio back to the stock 3.73 ratio.
For a 4.10 effective ratio, just plug in 4.10 for 3.73 in the same equation: 37 / 31.5 x 4.10 = 4.82. So 4.88's would be similar to a 4.10 ratio with stock tires.
If we plug in 3.90 for 3.73 in the equation: 37 / 31.5 x 3.90 = 4.58. So 4.56's would be similar to stock tires with a 3.90 ratio.
By the way, I run 4.56's with 33's on my gas-powered F350, for an approx 4.30 effective ratio
.
Last edited by SoCalDesertRider; Jul 21, 2004 at 09:22 PM.
Thread Starter
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Senior User
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From: Ormond Beach
Here is a sight with a gear ratio calculator
http://www.ring-pinion.com/calculato...latorsind.html
And true the 4.88's would be almost exactly like having a stock 4.10 rear end.
The end result will be about 200 rpm's more than what my stock 3.73 rear end produced.
Is 200 rpm that big a deal? I recently read an article in a truck mag that said that the factory ratios were generally to high and were for more general purpose. They recomended going lower if a person towed often or was mostly in town.
200 rpm higher than stock just doesn't seem like it will be that noticable.
http://www.ring-pinion.com/calculato...latorsind.html
And true the 4.88's would be almost exactly like having a stock 4.10 rear end.
The end result will be about 200 rpm's more than what my stock 3.73 rear end produced.
Is 200 rpm that big a deal? I recently read an article in a truck mag that said that the factory ratios were generally to high and were for more general purpose. They recomended going lower if a person towed often or was mostly in town.
200 rpm higher than stock just doesn't seem like it will be that noticable.
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From: Ormond Beach
Originally Posted by TOPFLOR
i vote 4.88
I will let you know what I think after that...
Thanks
all..
Doug D