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Old 06-08-2005, 05:52 PM   #1
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Getting ready to buy a new 05 f-350 dually with 4.10 or 4.30. Have had a 2000 f-350 srw with 3.73 rear end, and 80 hp supper chips. It has been a great truck, towed over 80,ooo miles in 5 years with just normal wear and tear.

The reason for going with duallys is for the greater GVWR, as we will probably be getting a new Hitchiker Champange that will have a lot more pin weight than our Snowbird.

What change should I expect in fuel mileage change going from 3.73 srw to 4.10 or 430 dually?

Thanks, Mike
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Old 06-08-2005, 05:52 PM   #2
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Getting ready to buy a new 05 f-350 dually with 4.10 or 4.30. Have had a 2000 f-350 srw with 3.73 rear end, and 80 hp supper chips. It has been a great truck, towed over 80,ooo miles in 5 years with just normal wear and tear.

The reason for going with duallys is for the greater GVWR, as we will probably be getting a new Hitchiker Champange that will have a lot more pin weight than our Snowbird.

What change should I expect in fuel mileage change going from 3.73 srw to 4.10 or 430 dually?

Thanks, Mike
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Old 06-08-2005, 06:15 PM   #3
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I can't really answer that but if I was to guess the mileage will go down with the rpm's, however, it will make for a much better towing experience, in my experience. I wouldn't consider anything less than a 4:10 if I was buying a ford. I wish I had that in the Chevy.
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Old 06-09-2005, 05:11 AM   #4
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I get 15-16 runnung around conbined driving.Towing gets me 8 in the hills and 10-12 on the flats.My trailer is heavy at 12,000 lbs scaled.I am of course running a 7.3 rather than a 6.0 but milage should be close.
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Old 06-09-2005, 06:13 AM   #5
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I have a 4:10 in my 2500. I would imagine it would be about the same. I get right at 20, maybe 19 on everyday driving. I actually got better pulling our popup. I'm thinking because it was level with the tailgate and we were getting some kind of Nascar draft effect. I really haven't noticed too much a diffrence when we went to 5'er, but there was some. I get right a 475 miles per tank empty and about 435 to 450 on the 5th wheel.
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Old 06-09-2005, 10:38 AM   #6
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as long as you keep it under 70 mph shouldn't be that big of a change. Over 70, mpg really starts to tank.

I have an F-350 with the TowBoss package (4:30's) on order.
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Old 06-09-2005, 02:52 PM   #7
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Go with 4.10's. The 6.0 is a different motor than the 7.3 it has a 4200 RPM red line and likes to turn faster. The 4.10's will put you at 2200 RPM at 68MPH and that seems to be the sweet spot. I had a Y2K 7.3 W/3.73's and now I have a 03 6.0 W/4.10's.

I would also stay away from any chips, tuners, modules; Ford is voiding warranties on modded trucks. They seem to be getting tough with any mods. I just had a turbo, inter-cooler and PCM put in mine and glad I didn't have to pay for it. The 6.0 will pull fine, stock with 4.10's and with the $ you save on any chips and things you can pay for the extra fuel the 4.10's will use, and keep your 100K warranty. I do have a 4" exhaust and a set of gauges, but that is it, and still see 1250' EGT on a hard pull.

Just my .02 worth
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Old 06-11-2005, 08:55 AM   #8
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We bought an E-350 van with v-10, 4.10 RA and 10K# tow limit. It seems to work very well. I k now some folks are more diesel prone, but we wanted a gasoline engine and more capability to load our TT.

So far with 2000 miles on it, towing has gotten 10.5 mpg and w/o tt has gotten 12.5 to 14.6 mpg. We are happy with this. The van weighs 6300# empty.

Sorry, but p/u trucks with duallies just seemed too big for us.

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Old 06-11-2005, 08:18 PM   #9
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This website will help you with your decision on gearing: gear calculator
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Old 06-29-2005, 09:16 PM   #10
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Mike.

Having had both a 7.3 (3.73 gears) F-250 and a 6.0 (4.10) gear dually, you can expect to get about 11.3 city, 16 something highway unloaded. Loaded expect around 9.5 towing.

Of course, I only have 13,000 on the dually and expect the mileage to go up as it is broken in.

Without doubt, I like the stability and ride of the dually better - unloaded and loaded.

My 7.3 was chipped, but not my 6.0 (don't need it). An Awsome truck!
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Old 07-01-2005, 07:17 AM   #11
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I have a 2000 F350 dually with the 7.3 with 4:10 gears. The best I have ever got was 17MPG at 60mph. Normal on and off freeway is 14-15mpg. Towing is 8-9mpg pulling a 12,000+ Alfa triple. Like the other posts say, mileage should be similar.

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