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Old 01-31-2004, 12:22 AM
CircleV CircleV is offline
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mpg? 4.30 vs 3.73 gears

I'm looking for a used F250, probably with a v10 and I wondered how milage compared. I will be putting on at least 285's and maybe even up to 315's if I can make them fit w/o too much lift.
Is there an easy way to check a used truck to determine what ratio it has?
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Old 01-31-2004, 12:31 AM
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At 70 MPH my 3:73 is running at 1900 RPM. Same day, I drove the 4:10 and at 70 MPH i was at 2200 RPM. There is a difference. Dad has the 4:10 and I get 11.5 when driving it mixed, I get 13.2 when driving mine mixed. I am not sure, but I think you can check the ratio in the door jam.

I have a buddy at the river who has the 6 speed w/4:10, and he gets 14.5 mixed driving. But he bought his in Nevada where you can get the 6 speed in an V10. I cant here, or I would have gotten the 4:10.
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Old 02-03-2004, 06:42 AM
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I think the V-10 only comes with 3:73's or 4:30's, mine with the 4:30's at 60 mph is at 2000 rpm with the 6-speed tranny, best mpg so far is 9.9 with no real trips, and mostly all around town driving.

Later,,,,,,,,,,Mark
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Old 02-03-2004, 08:54 AM
LK LK is offline
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I'm not sure there's a big mileage difference between the 3.73s and the 4.30s - while the 4.30s definitely increase the RPMs, I don't think that they use much more fuel.

On my truck - 2004 4x4 crewcab auto w/4.30 gears - I've gotten an all-time best of 13.5mpg and an all-time worst of 9.9mpg, and overall I'm averaging about 11.5mpg. Since all 8,000 miles on my truck were put on in the last two months, those are winter mileage figures - so summer mileage figures would probably be a little better. Also, at least half of those miles are with the hubs locked, and probably 1,500 of those miles I had the truck in 4-hi - and even running 4-hi I've only ever had two tanks that dropped below 10mpg (both at 9.9). While I've towed with the truck a few times, it's usually for less than 50 miles - so I don't really have any separate towing mileage numbers.

This is a mixture of perhaps 75% highway driving (at 70-80mph) and about 25% city driving. At 80mph I'm turning about 2,700-2,800 rpm - and my tires are 235/85r16s, which are about 32" tall.

Anyway, as far as I can tell the 4.30 gears don't seem to hurt mileage very much.

LK
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Old 02-05-2004, 02:50 AM
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circlev,
its all in how you drive it. i can grandpa mine around (3.73 auto) and get 11 or so in town and over 16 on the highway...

or i can drive like i normally do and get about 9 in town and 15 on the highway.....

if you have a super heavy foot, i wouldnt expevt to get over the single digits though.

my best is 17.5 my worst is 3 (the 3mpg was comming up a loooooong mountain hill, pulling about 12kat 45 -50 mph)
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Old 02-05-2004, 08:55 AM
benr0 benr0 is offline
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High 18, low 8.5 towing.
Normal hwy avg 15-16 at 65. @12 in town.

Still what bothers me is how it drops when my foot is weak and I can't hold it off the go pedal....but its so much more FUN!
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Old 02-05-2004, 09:18 PM
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Nomo always said that the magic number for the V10 was 2000 rpm. Keep it below that and enjoy much better mileage than any driving done above that.

m350 - I think the 4.10 is offered but not with the LS option. If you want LS, you have to choose 3.73 or 4.30.
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Old 02-08-2004, 11:10 AM
Edmo Edmo is offline
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Similar to LK...

2001 Crew Cab 4x4, V-10 auto, limited slip 4.30 gears with 26575R16 tires.

City - 8-10 MPG
Highway - 12-14 MPG
Daily driver - 11.5 MPG
Towing 28' travel trailer - 7-10 MPG, depending on terrain & wind

The 4.30 gears reduce high speed mileage a little, but give you several advantages over the 3.73 gears:

- As you put bigger tires on your truck the ratio drops... Starting at the lower 4.30 may give you a high enough ratio to not require new gears.
- Higher tow rating... Click here and click on the "Towing Capacities" along the left side.
- Better acceleration from a stop.

Edmo
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Old 02-09-2004, 01:11 AM
68 351 bronc 68 351 bronc is offline
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LK if you put bigger tires on but did not recalibrate your speedo than your actually getting better milage than you think. Your traveling farther between fillups than what your odometer says.
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Old 02-09-2004, 08:24 AM
LK LK is offline
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The 235/85r16s are the stock all-terrain tires you can get with the FX4 package. I've thought about going with larger tires and a small lift (which is part of the reason I got the 4.30s), but for now I'm going to keep these tires until at least spring - they seem to do pretty good in the snow. At least, they're good on-road - there's too much snow to get off-road anymore, even if I did have the lift and larger tires.

Maybe one of those track setups would work...hmmm...

LK
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Old 02-09-2004, 10:10 AM
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Re: mpg? 4.30 vs 3.73 gears

Quote:
Originally posted by CircleV
I'm looking for a used F250, probably with a v10 and I wondered how milage compared. I will be putting on at least 285's and maybe even up to 315's if I can make them fit w/o too much lift.
Is there an easy way to check a used truck to determine what ratio it has?
Like gus said, On the door frame sticker, at the bottom, under AXLE you will find the code.
For example:
F1 = 3.73
F2 = 4.10
F3 = 4.30
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Old 02-23-2004, 07:27 PM
lman31 lman31 is offline
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If you are going with 285's or larger, I would recommend the 4.10 or or 4.30 gears.
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Old 02-24-2004, 03:00 AM
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Quote:
Originally posted by nafzimo
m350 - I think the 4.10 is offered ...
4.10s are only offered with the 5.4L. Too bad, too. Would be a perfect ratio for the V10.
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Old 02-24-2004, 06:30 AM
redvoyager redvoyager is offline
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I have a IDI that I just changed to a zf 5 speed from an E4od and my mileage went from 12 to 14. My tach turns about the same and I am thinking of swapping to a 3.55 from the present 4.10. Tach right now is 2500 at 70
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Old 02-24-2004, 06:30 AM
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