MPG w/ 4.56 & 35s - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 17 (permalink) Old 07-20-2006, 04:22 AM Thread Starter
 
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MPG w/ 4.56 & 35s

First off, hi yall, I'm new here, and a recently new owner to the 6.0 (made a mistake a bought a 12v first), but anyway......

I've got an 04 6.0 with 35's and 3.73 gear and now power mods and I'm only gettin about 13mpg if I'm lucky in the city, and MAYBE 13.5 on the highway (and this is all unloaded). I know that these trucks get AROUND 16 stock and I'd like ot get close to that before I start dumpin money into it for intake, exhaust and a programmer, so basically my question is, do any of y'all have this setup (35's with 4.56s) and if so what kind of mileage are y'all seeing both highway and city? thanks for any info.

--Ryan
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post #2 of 17 (permalink) Old 07-20-2006, 04:40 AM
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4.56's are going to be too steep for 35's.

How many miles do you have on your truck? If the miles are really low, you'll slowly start to see the mpg increase as you put more miles on and the motor breaks in.

My truck came stock with 34's and I opted for the 3.73's. I was seeing about 15-16 mpg in combined city and highway driving. I added a 4" turbo back exhaust, a SCT, and an intake and I've been averaging 16-17 mpg in mixed (city/highway) driving and over 18 on the highway.

If you really want to re-gear, I'd go with 4.10's and no higher than 4.30's.

Just my $.02 and hope it helped.



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post #3 of 17 (permalink) Old 07-20-2006, 04:45 AM Thread Starter
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Quote:
Originally Posted by Snake
4.56's are going to be too steep for 35's.
How many miles do you have on your truck? If the miles are really low, you'll slowly start to see the mpg increase as you put more miles on and the motor breaks in.
My truck came stock with 34's and I opted for the 3.73's. I was seeing about 15-16 mpg in combined city and highway driving. I added a 4" turbo back exhaust, a SCT, and an intake and I've been averaging 16-17 mpg in mixed (city/highway) driving and over 18 on the highway.
If you really want to re-gear, I'd go with 4.10's and no higher than 4.30's.
Just my $.02 and hope it helped.
--Snake
I've only got about 67K on the truck right now, should the motor be broke in by now? Thanks for the info.... I just didn't think that goin from 3.73s to 4.10s would make a big difference, but that's why I'm askin you guys.
--Ryan
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post #4 of 17 (permalink) Old 07-20-2006, 05:52 AM
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Don't quote me on this but I thought ford motorsport made a 4:30 gear, thats what i'll be looking for in the near future.

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post #5 of 17 (permalink) Old 07-20-2006, 07:22 AM
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Yeah, at 67k mi you're definitely broken in :Thumbup:

--Snake

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post #6 of 17 (permalink) Old 07-20-2006, 11:57 AM Thread Starter
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Quote:
Originally Posted by Snake
Yeah, at 67k mi you're definitely broken in :Thumbup:

--Snake
That's not what I was wantin to hear. And I was gonna try and stay away from Ford Motorsports for the sheer fact that they're proud of their stuff. I wonder if anybody else has any experience. I sure hope so. haha

--Ryan
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post #7 of 17 (permalink) Old 07-20-2006, 12:01 PM
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umm 4:10 gear is pefect for a 33" tire and 4:56 is good for a 35" tire those are the gears we allways matched up when we build rearends going in to a offroad rig.... and the speedo is usually very close to stock.. just my .02
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post #8 of 17 (permalink) Old 07-20-2006, 07:26 PM
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My truck, 38" tires and 4.56 gears, I get 15.5 mpg on the highway and 14 in town and an SCT programmer

My truck, when I had 35" tires and stock 3.73's, I got 20.7 mpg on the highway and 18 in town and an Edge module.

I run 4.56's and they're as low as I'd want with 38's, in fact, I'd rather have 4.30's. Reason I went with 4.56's is in case I want 40's in the future. 35's with 3.73's are a perfect combo, just a little hard on an auto trans. I would go with 4.10's at most with 35's unless you plan on going bigger. These trucks mpg's are affected by rpm more than tire size, IMO. The torque these things produce don't notice the tire weight as much, mileage wise, as it does keeping the revs way up there.

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post #9 of 17 (permalink) Old 07-20-2006, 09:12 PM Thread Starter
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thanks for the info moose and sredish..... now I've got some decidin to do... my main reason too is I'll be towing my rock crawler often long distances, and thru mountains and such, and the torque would be nice for that.... dang, now I'm torn.

--ryan
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post #10 of 17 (permalink) Old 07-27-2006, 07:50 PM
 
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i would do the 4:56. I had them in a jeep years ago with 35's and they where fine. My current suv (G500 mb) has 4:38 gears and 31 tires. does ok in town but truns some RPMs at 80.

Ford does make 4:30 gears, they come in the big bundel tow package.

Depending on price i would go with more gears. Its better to have to much gear and run a little larger tire next go around than to be undergeared and want more power.
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