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post #1 of 5 Old 08-08-2011, 02:05 PM Thread Starter
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F550 questions

I currently have a 2009 F550 4x4 141"wb. I love the truck but I hating the 6mpg that the 6.4 is giving me, I am also starting to really lose faith in the truck. It has never let me down but when it regens every 40 miles I know it is coming. I also have a 2002 QCSB and LOVE it. My question is what besides the motor and trans are the differences in a F550 with a 7.3 vs a 6.4. The 6.4 will out turn any vehicle on the road my 7.3 sucks do all F550s turn tight or just the newer ones? I cannot imagine the difference being too extreme, but as the 6.4 was my first Ford I really do not know. I only got the 7.3 in Feb so I am still learning.

2009 F550 XLT RC Custom 9" flatbed 6.4 4x4 fuel hog
tow beast

2002 F350 SRW CCSB 4x4 Sun Coast Trans TC and Controller Intake and 4" MBRP
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post #2 of 5 Old 08-10-2011, 04:49 AM
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all of the '05+ trucks turn sharper than the previous leaf sprung front end trucks. their axles are wider.

Delete the DPF on your truck and get a spartan tuner or something of the likes your truck will make a lot more power, use less fuel and also stop regenerating. Also with an F550 I'm guessing your rear end gear might be the 4.56, that will not help MPG much either at highway speeds.


02 F-250 7.3 Powerstroke PMF Suspension 20" XD Hoss 325/60R20 Dura-Tracs
38R 4" MBRP TW Chip HPX Mod EBPV delete 6637 Billet Converter Shift Kit Autometer GS
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post #3 of 5 Old 08-10-2011, 05:41 AM
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We have a 550 @ work w/ 4.88 gears, fuel mileage isn't bad though

Maybe put a little bit bigger tires on it?
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post #4 of 5 Old 08-27-2011, 10:20 AM
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My 2000 F550 don't like to make u turns to good either
And with 4.88 gears and stock 225/70/19.5s I'm tacking out at
2500 rpm 65mph. Not good on fuel either running at 10-12 mpg
Just did the AIH delete this morning and going to do the EOT mod for
More injection timing since I running 6speed
I only drive 55mph these days

2000 F550 DRW. 4x4 manual Trans
AIH delete
Glow shift guages
98gal transfer flowtank
Riffraff 6637 kit
Ccv mode
Wicked wheel
4" mbrp
PAC brake with aux air tank to air stuff up
TS chip 6 pos
Riffraff hpx crossover
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post #5 of 5 Old 08-27-2011, 06:45 PM
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uh yeah dump the dpf run some real exhaust, spartan tunes and that 6.4 will get ALOT better mileage plus run longer

2003 Ford F250 6.0 powerstroke 4x4.
ZF6 manual trans, ext cab short bed
deleted, 4 inch exhaust, gauges, traction bars
16x10 Weld wheels wrapped in 33s


Early 1999 Ford F250 7.3 Powerstroke 4x4
Crew cab short bed
straight pipe, intake
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