MPG Difference: 3.55 versus 3.73

[haze]

Any idea how much mpg will drop with a 3.73 instead of 3.55? Thanks

[Ford Fan#1]

Any idea how much mpg will drop with a 3.73 instead of 3.55? Thanks id have to say .5 - 1 mpg. Depends on how you drive or where you drive.

[Jersey_Joe]

id have to say .5 - 1 mpg. Depends on how you drive or where you drive.
Kid. If u don't know. Please don't guess.
I have the 3.55's. I average anywhere between 18-22
My buddy has the same truck in an fx4 and 3.73's he gets 15-17. And we drive about the same.
Your Rpms are higher with the 3.73's. Thus the small plunge in mpg. Now. That is just between our trucks. Others vary. Just giving my scenario hope I helped

5Star tuned.....

[Ford Fan#1]

Kid. If u don't know. Please don't guess. I have the 3.55's. I average anywhere between 18-22 My buddy has the same truck in an fx4 and 3.73's he gets 15-17. And we drive about the same. Your Rpms are higher with the 3.73's. Thus the small plunge in mpg. Now. That is just between our trucks. Others vary. Just giving my scenario hope I helped 5Star tuned..... yeah you are right sorry

[Jersey_Joe]

yeah you are right sorry
Small potatoes kid. Not a sorry thing. But guessing ? Not the best. Some things call for a good guess. Unfortunately this was not one of em. We just Gota get a little more knowledge in u!!! Lol

5Star tuned.....

[Ford Fan#1]

Small potatoes kid. Not a sorry thing. But guessing ? Not the best. Some things call for a good guess. Unfortunately this was not one of em. We just Gota get a little more knowledge in u!!! Lol 5Star tuned..... yeah. And I've learned ALOT from you and the other members.

[Jersey_Joe]

yeah. And I've learned ALOT from you and the other members. well that's awesome!!! Always here bud. I was young once too

5Star tuned.....

[Ford Fan#1]

Any idea how much mpg will drop with a 3.73 instead of 3.55? Thanks since you said the truck would be used for interstate driving I would get the 3.55. Maybe even the 3.31. The 3.55 would be better for towing and have more "pickup" then the lower gearing. But the lower gearing will give you better fuel mileage and have less wear on your motor due to the Rpms being lower then what you would have if you had higher gears. But if you want big tires and go mod crazy then you want higher.

[haze]

That's pretty clear, Ford Fan. Joe's 3-5 mpg penalty is a high price tag for more proportional tires. This was a good reality check. BTW: the Mrs revealed that she supports the plan - a surprising plus! Think I'll keep her. (Full disclosure: she gets a new SUV out of the deal).

[Jersey_Joe]

That's pretty clear, Ford Fan. Joe's 3-5 mpg penalty is a high price tag for more proportional tires. This was a good reality check. BTW: the Mrs revealed that she supports the plan - a surprising plus! Think I'll keep her. (Full disclosure: she gets a new SUV out of the deal).
Cool name btw lol. 3.55's are great for all around bud. I've had no probs. pullin. Racin. All good. Good luck. Sounds like u got a keeper btw lol

5Star tuned.....

[BFEB]

since you said the truck would be used for interstate driving I would get the 3.55. Maybe even the 3.31. The 3.55 would be better for towing and have more "pickup" then the lower gearing. But the lower gearing will give you better fuel mileage and have less wear on your motor due to the Rpms being lower then what you would have if you had higher gears. But if you want big tires and go mod crazy then you want higher. hears go opposite bud. 3.31 is a higher gear than 3.55 and 3.73 is lower.

[Ford Fan#1]

hears go opposite bud. 3.31 is a higher gear than 3.55 and 3.73 is lower. then why would it make the Rpms higher in overdrive at 60 if i have 3.73 and my dad has 3.55s? Not saying you are wrong just saying it doesn't make sense to me

[FX4Life]

then why would it make the Rpms higher in overdrive at 60 if i have 3.73 and my dad has 3.55s? Not saying you are wrong just saying it doesn't make sense to me
It's just how you say it.....4.10 gears are "lower" than 3.55

[Ford Fan#1]

It's just how you say it.....4.10 gears are "lower" than 3.55 ah. Now I get what he ( and you ) were saying

[Jersey_Joe]

Seeeee? Learn something everyday

5Star tuned.....

[BFEB]

then why would it make the Rpms higher in overdrive at 60 if i have 3.73 and my dad has 3.55s? Not saying you are wrong just saying it doesn't make sense to me it's because any gear # is a ratio to 1. So the closer the number is to 1 (direct drive) the higher the gear. That's also why it's called overdrive. Cause the gear ratio in your transmission for that gear is actually less than a 1:1 ratio ---------- The advertised gear ratio is simply the final drive ratio. Each gear in your tranny has its own ratio