2008 F450-6.4L Rated at 325 HP and 600 Torque - Page 2 - Diesel Forum - TheDieselStop.com
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6.4L Power Stroke Engine and Drivetrain Discussion of the 6.4L Power Stroke diesel engine and drivetrain in the 2008-Up 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.

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Old 11-14-2006, 08:42 AM   #16 (permalink)
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Re: 2008 F450-6.4L Rated at 325 HP and 600 Torque

As a user(18500 lb fifth wheel RV) Could someone please explain the rationale for doing this. How does this effect my hauling experience. I spend a lot of time in the mountains going over the rockies on 70 for example with long 6,7 percent grades. my 99.5 7.3 even modded doesn't like doing that very much. Especially the R400 which required rebuilding when I got home

Would the 350 with 350,650 be a better choice. I would be right on the max 26000 cgwr in that case. to me the 450 gives me greater margin for error, but also seems like the increased horsepower and lighter truck would result in a better pulling experience. I have electric actuated hydraulic brakes which are known to work with the tow command. I thought I knew what to do but now I am more confused. So, what say you gurus about my choices.
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Old 11-14-2006, 01:15 PM   #17 (permalink)
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Re: 2008 F450-6.4L Rated at 325 HP and 600 Torque

I say go with the F450...your towing experience would more likely be much better with a little bit of a margin (not to mention safer). The heavier truck will actually give you a better towing experience. Ford has rated it to tow more for a reason. The number of HP and torque are not the only deciding factors when towing. You have to take into account stopping ability, gears, frame size, etc., etc.

I would consider Ford the guru here, not us armchair diesel engineers. That's just my opinion though.
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Old 11-15-2006, 05:52 AM   #18 (permalink)
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Re: 2008 F450-6.4L Rated at 325 HP and 600 Torque

My 06 F550 at work with 4.88's runs only 55 mph at 2000 RPM. Cruising at 70 mph its turning around 2500 RPM.
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Old 11-15-2006, 07:25 AM   #19 (permalink)
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Re: 2008 F450-6.4L Rated at 325 HP and 600 Torque

I understand about the margin and I am inclined to get the 450.
But, I continue to wonder. I now have the F550 fontaine(4.88) which with hitch and all weighes in at about 10000 lbs. the 5ER weighs 18200 loaded. So, I am at 28200 lbs which is 2200 lbs over the 26000 GCWR. The new 350 with the 6.4 (4.30)would weigh in around 25500 loaded almost 3000 lbs lighter and with evidently more HP and Torque, and probably better fuel mileage than the 4.88. The old 7.3 did a good job but the transmission has been a weak point. So now there would be the better tranny as well, so it seems like no so easy an answer. I would appreciate anymore thoughts that may be out there.

Is the reduced HP and Torque perhaps because you are always running higher RPMs due to the 4.88 rearend?

Larry
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Old 11-15-2006, 08:05 AM   #20 (permalink)
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Re: 2008 F450-6.4L Rated at 325 HP and 600 Torque

I am in the same situation as larry5thwheel. I have a 2001, F550,
Fontaine, the transmission is definately the weak link. I am on my third transmission, 2nd torque converter, with only 71000 miles on it. I am looking forward to a new tow vehicle. The question is more power F350. Maybe more reliabilty and safety F450. When I first saw the specks I thought that would be great. Now maybe I should have bought a 2007.
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Old 11-15-2006, 10:11 AM   #21 (permalink)
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Re: 2008 F450-6.4L Rated at 325 HP and 600 Torque

I really need a truck that can tow more weight than my current truck. Our fifth wheel weighs easily 22,000lbs with a pin weight of probably 5,000lbs. I have been holding out for the 08's(really like the new interior) and thought that the F-450 pickup would be all I needed. Now I have found out that the pickup will not be the same truck as the F-450 cab/chassis and the engine is detuned. Well, I guess I am back to square one. I guess only the F-550 heavy tow will be enough truck for our needs. I am not worried so much about the lowered power output or the speed limiter, but the GVWR of the F-450 pickup is it's downfall for me. Is this truck just a upgraded 350 or is it truely a 450 cab/chassis with a factory bed installed?
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Old 11-15-2006, 10:24 AM   #22 (permalink)
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Re: 2008 F450-6.4L Rated at 325 HP and 600 Torque

I believe SmokeyWren reported that the framerails were the same width apart as the F-350. The F-450 pickup would benefit from the bigger brakes w/19.5" wheels and higher capacity axles. Otherwise it's probably the same as an F-350 Tow Boss. I think I would consider an F-450 Chassis Cab with a tow body. No doubt it will also have the reduced hp/tq ratings but have a higher GVWR.
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Old 11-15-2006, 02:05 PM   #23 (permalink)
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Re: 2008 F450-6.4L Rated at 325 HP and 600 Torque

[ QUOTE ]
I am in the same situation as larry5thwheel. I have a 2001, F550,
Fontaine, the transmission is definately the weak link. I am on my third transmission, 2nd torque converter, with only 71000 miles on it. I am looking forward to a new tow vehicle. The question is more power F350. Maybe more reliabilty and safety F450. When I first saw the specks I thought that would be great. Now maybe I should have bought a 2007.

[/ QUOTE ]

And we are in the same situation. Have a 99.5 F-450 w/Fontaine bed rated 26,000# GCWR. Truck weighs 9600#'s and Travel Supreme weighs 20,000#'s for a total just shy of 30,000#.

I'm looking at the possibility of moving to the 2008 F-450 Pickup. Look at the 2008 Super Duty Order Guides The F-450 Pickup is available with the heavy duty tow package which churns out 33,000# GCWR.

Waiting to see the specs so I can check out the height of the pickup bed side rails and determine what height 5th wheel hitch I need to keep the fiver level and give me adequate clearance.

Dave
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Old 11-15-2006, 02:20 PM   #24 (permalink)
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Re: 2008 F450-6.4L Rated at 325 HP and 600 Torque

I am sure that the power reduction is done via software. Just give some of the tuners a little time and they will be blowing that little difference away. Or even better just have the dealer flash your 450 with a 350 program(if you have a good dealer).
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Old 11-24-2006, 09:10 AM   #25 (permalink)
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Re: 2008 F450-6.4L Rated at 325 HP and 600 Torque

For all you wondering about whether or whether not this new body model F-450 has the chassis of the current 350 or the chassis of the current 450 model. As a Ford technician at a dealership in the metro atlanta area, I can tell you that the F-250, 350, 450, and even the 550 all have the exact same chassis, engine, steering box, and transmission. The difference lies in the front and rear axles, the F450 and F550 of current (or past) relies on a much larger rear axle with the F550 being much heavier than all. But folks, the heart of this matter is that the Ford super duty is so far superior in its absolutely industrial build, that this new 450 will dominate as its predecessor has. Sorry, duramax lovers, but I am not convinced in a diesel with an aluminum block and heads, yeah its quieter, less dense metals compose the duramax, for the long haul, and the rock solid suspension and axle setup, you cannot beat that solid Dana 60 under your front end. Ford knows what they are doing when it comes to trucks, and yeah, that 6.0 was a slip up, but they realized it... believe me, I have seen my share of 6.0 problems. But I have faith in this new 6.4l
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Old 11-24-2006, 01:36 PM   #26 (permalink)
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Re: 2008 F450-6.4L Rated at 325 HP and 600 Torque

I thought the 450/550 have a different width frame rail set-up for body upfitters.
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Old 11-24-2006, 03:15 PM   #27 (permalink)
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Re: 2008 F450-6.4L Rated at 325 HP and 600 Torque

[ QUOTE ]
For all you wondering about whether or whether not this new body model F-450 has the chassis of the current 350 or the chassis of the current 450 model. As a Ford technician at a dealership in the metro atlanta area, I can tell you that the F-250, 350, 450, and even the 550 all have the exact same chassis, engine, steering box, and transmission.

[/ QUOTE ]


I hate to dissappoint you BUT the 250-550 cab and chassis have a narrower frame than the trucks that have beds on them. The cab and chassis models also have a flat frame rail to accomidate commercial add-on bodies. They do have for the most part the same axles steering and so-forth but the frames are definetly different.The C&C 250-350 SRW share frames which are not the same as the C&C 450-550 which also share frames. The dually C&C F350 is all alone. The pickups have a wider frame. I don't know about the 08 F450 pickup yet. Its not in the current parts catalog. I sell frames on a regular basis at a Ford Dealership. I have been selling parts for 22 years. The frames are not all the same per the parts catalog that I sit in front of right now. Don't believe me? Get your tape measure out. [img]/ubbthreads/images/graemlins/wink.gif[/img]
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Old 11-26-2006, 07:00 AM   #28 (permalink)
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Re: 2008 F450-6.4L Rated at 325 HP and 600 Torque

Jonboy -if your a tech you should know that the Duramax has a cast iron block--only the heads are aluminum
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Old 11-26-2006, 11:03 PM   #29 (permalink)
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Re: 2008 F450-6.4L Rated at 325 HP and 600 Torque

[ QUOTE ]
As a Ford technician at a dealership in the metro atlanta area...

[/ QUOTE ]



Which dealership?
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Old 01-18-2007, 10:00 PM   #30 (permalink)
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Re: 2008 F450-6.4L Rated at 325 HP and 600 Torque

[ QUOTE ]
It is 100% true, the F450 & F550 trucks will only be 325/600. Top speed of the F450 Pickup will be 81 mph

[/ QUOTE ]
That might have been true on 11/12/2006 in the Preview Guide but I have only seen the 350HP 650TQ rating on every Ford website and order guide for 2008 F450/F550 6.4L PSD's this month.
Ford Fleet F550 specs
media.ford.com F450 specs
Ford F450 PU Order Guide
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