Hi everyone. I'm just ordering my truck this week and I have to decide between the 3.73 or the 3.55 gear for the rear end. Does anyone know if the 3.73 will be a lot harder on gas or is the difference negligible? I do mostly highway driving. I was told that if I want the trailer tow package in 2013 you can't also get the 3.55.
There will be an MPG difference, albeit a very small one. If you don't tow very often, and don't plan to level/lift and get bigger tires, the 3.55 should be a nice highway driver.
If you are considering the max tow package, then you probably do plan to tow at some point, I would consider the 3.73. I have those coupled with the 5.0 v8, and it is a great town driver, and still gets 20-21mpg on the highway (flat, 65mph).
Best of luck!
__________________ Chris - 2011 F150 XLT 5.0
"All we have to decide is what to do with the time that is given us." -J.R.R. Tolkien
Last edited by cwrose; 07-18-2012 at 12:15 PM.
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Get the 3.73's. For what it's worth, I think that the engine is more in the "zone" for torque on the highway, and you will have LESS downshifting with the 3.73's.
I know that with my EB, I cruise at 75 right at 1,980 rpm. The torque curve starts to come on in the EB at 1,700 rpm, so the engine is making enough power at that rpm to stay in 6th most of the time.
Not sure it would do that if it were attempting to maintain that speed at a couple of hundred less rpm.
That, and if you ever plan on towing, the max tow is THE way to go. It will give you much needed "headroom" for towing weight. Don't handicap yourself going in when trailer shopping!
In changing times, one must live by unchanging principles.
I have RCSB 2wd 5.0 with 3.31's. it is definitely NOT in the power band of the engine at cruise speeds and almost any acceleration requires a down shift. I WANTED 3.55's but couldnt find a truck locally the way I wanted with anything but 3.31's. I figured if it was really that bad I could always regear it later on.
truth be told I dont think even a 3.55 will put the 5.0 in it's sweet spot.
GO 3.73 and dont look back.
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I follow the others here. Get the 373. Better to have it and not need it than need it and not have it. The mpg difference is so minimal vs the additional towing capacity offered that it's worth it.
I have the 355 and wish I had followed my own advice
Wish I had the 3.73's to help with the larger tires and when I tow. My old truck with the 5.4 and 3.73's had a lot more low end pull then the 5.0 with 3.55's. Torque range with the 5.0 is a little too high. Just my opinion.
2013 Platinum 4x4.. Ingot Silver with Pecan leather..Ecoboost engine with 3.31 E-lock...Huskyliner's front and rear...F150 bed mat...BakFlip VP cover...Toyo P275x60x20 AT2's..Bilstein 5100 shocks...tinted fronts..Boost Bar to match upper grille.