6.4L Power Stroke Engine and DrivetrainDiscussion of the 6.4L Power Stroke diesel engine and drivetrain in the 2008 Super-Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.4L Power Stroke engine.
Has anyone actually improved thier fuel mileage in 2008 F450 by either installing a Gear Vendor, swapping the diffs (4:88's for ???), or something else?
I love my truck, but not the RPM's it turns on the freeway.
OK. So the "should've" aside, will a truck that came with 4:88's see an improvement of 2 mpg by installing 4:33's?
Or is there perhaps some other difference that would mask the impact of just changing the ring & pinions? (I'm can't think of anything, but you never know...)
You should have ordered the 4.30's. You'd be getting about 2 mpg more on the highway. LS
I don't get any better mileage than the guys with the 4.88. In fact, it seems the 4.88's are getting better mileage towing. I have been watching what people post about mileage on the F-450.
Shawn
__________________ 2008 F-450, 4 X 4 with 4.30's, auto with manual transfer case with factory cup holders. All options except sunroof and nav. Line X with Extra. 24K Draw-Tite Signature Series Fifth Wheel Hitch. 65 Gallon KSH Marine fuel/tool combo in bed. Viar 480C compressor with 8 gallon tank. Hadley Air Horns hooked up to Auto Mate alarm. PICTURES
I've got the 4.30's and combined mileage according to the trip computer stays around 11mpg. I can get around 12 during interstate driving if I keep my speed around 65mph. Love the truck, in fact the truck would be almost perfect if the mileage could be better.
You should have ordered the 4.30's. You'd be getting about 2 mpg more on the highway. LS
That is if 4:30's were offered when I got the rig...
BUT I am getting almost the exact same MPG as JESSE 1 running the 4:88's, so it does not seen to be making much of a difference
~Mike~
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2008 F-450 CC Lariat...Plus moon roof
I have come to the conclusion that 4.30's allows you to drive 65mph, while the 4.88 450 drives 60mph, and they each get app. the same fuel mileage.
4.30=65mph
4.88=60mph
Since I got the 4.88s, I am driving in the right lane. Problem is, I am holding up both lanes of traffic, due to the Dodge boys and Chevy/GM guys slowing to gawk at the beautiful beast.
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2008 F-450 Lariat Dark Stone Metallic over Pueblo Gold 4x4(manual shift transfer case, manual hubs), High capacity tow 4:88s, Off Road, Camper packages, Sirius Sat, Upfitter switches, DVD entertainment, tailgate step, traction control, Audiophile 6-disc, PTC Supplemental heat and heated seats(warm buns), rear sensors, traction control, tailgate step. Built May 8, delivered May 24
Reese Signature Series 24k fiver hitch, I installed it myself, best hitch I have found yet
Line-X bedliner, heavy duty floor mats
2003 Sunline F281SR(weekend getaways)
SeaRay 215EC http://community.webshots.com/user/C...host=community
OK. So the "should've" aside, will a truck that came with 4:88's see an improvement of 2 mpg by installing 4:33's?
Or is there perhaps some other difference that would mask the impact of just changing the ring & pinions? (I'm can't think of anything, but you never know...)
If you're complaining about rpms, economy & speed, "should've" becomes shouldn't have. Why did you buy the truck if you are sweating the load over economy? If you NEED the truck, that's one thing and you takes what you get for economy and pass the cost of operation along.
If its for recreation, than it becomes part of the cost of recreation, and thats just how it is.
OMC
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Feb 03 6.0 Silver F-250 SD SC XLT long box, 6-spd 3.73ls, Fx4, Stock, Spray-in liner, Contico box.HARPOONED.
very very true OMC.....but did we forget the numbers on the window sticker indicating fuel economy...ooooh i forgot there isnt any. THIS VEHICLE IS NOT RATED FOR FUEL ECONOMY......which means "thats just how it is", OMC
One gentlemen make a comparison of 4.30 vs. 4.88. at 60 and 65 MPH. The 6.4 produces about 90% of it's torque curve at about 2,200 RPM or 4.88's at 60 MPH. The better mileage is at that RPM. reducing the RPM would have quite a negative affect on mileage and tow performance
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2008 F-450, 4 X 4 with 4.30's, auto with manual transfer case with factory cup holders. All options except sunroof and nav. Line X with Extra. 24K Draw-Tite Signature Series Fifth Wheel Hitch. 65 Gallon KSH Marine fuel/tool combo in bed. Viar 480C compressor with 8 gallon tank. Hadley Air Horns hooked up to Auto Mate alarm.
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