All but one that responded to my query re: which rear end they ordered, ordered the 4:88 which gives the maximum payload and towing capacity.

It is my understanding that the brakes and suspension is the same regardless of which rear end you order and that the f450 is stronger than the f350 with tow boss in that regard, even with the 4:30.

Basically the only real difference is the load on start-up on the transmission is greater with the 4:30 than the 4:88.

Is my understanding correct or there other significant differences?

 

There is a difference in HP and TQ ratings of the motor depending on choice of rearend and transmission.

 

The standard F450 looks like it comes with the 4:30 with the standard power. The upgraded 4:88 will have the detuned engine. This info I have found based off the order guide and the new brochure.
The tow capacity looks to be with 4:30/4:88 :
The Automatic is 20K/24K
The Manual is 18K/19K
Not sure why the manual is much less, especially with the 4:88’s.
I would think the 4:88 should be at least around 21-22K with the
manual. I’m thinking that Ford is trying to push there automatics.

 

25hp really makes that much difference?

 

It’s not the Hp, but the trq which is 50 more on the 4:30. Not to mention you get a little bit better mileage out of it. <O</OIf you get the auto it might make more since to get the 4:88, you gain 4000lbs of towing cap. <O</OIt may not make since if you get the manual. You only gain 1000lbs. Which I thank the 4:88's should be a lot more on the manual. Which I was leaning towards the 4:88's and installing the gear vendor on the truck. With the after market device it would give a final equivalent ratio with the 4:30/4:88 of 3:30/3:80. Image with running the 4:88's that you will only be taching out around 1800rpms while doing 65-70 on the freeway <O</O

 

I guess I missed the boat.

 

Na, You were fortunate enough to get your truck ordered. I’m still waiting to order mine. I got the rolling 5 star hotel ordered, but still working on the truck.<O</O

 

I got the you you got the hotel

 

Cool, mind if I borrow your horse to pull my cart to Alaska this summer?

 

I don't get to come with?

 

https://www.fleet.ford.com/showroom/...guideDec06.pdf

Here is the Ford site towing quide. As you see with the manual transmission the main difference is in GCWR. The auto with 4:88 is 33,000# and the manual with 4:88 is 28,000#. with 4.30 rear end auto is 29,000# and manual is 27,000 GCVW. The 5the wheel trailer towing with 4.88 is 24,500# with auto and 19,500# with the manual. The convential trailer towing numbers are the same for both transmissions at 16,000#.
The only difference in 4.30 and 4.88 is the towing rates. The spring rates are the same front and rear. Maximum front spring rates for the f-450 are 7,000# compared to 6,000# for the F-350. The rear spring rates for the F-450 are 11,000# with the 4.30 rear compared to 9.000# for the F-350. Front axel rates for the F-450 are 7,000# for both 2wd and 4X4. Front axel rates for the F-350 are 6,000# for the 4X4 and 5320# for the 2WD. Rear axel rate for the F-450 is 11,000# (dana 110). Rear axel rate for the F-350 is 9,000# (dana super 80). The reason for the lower 5th wheel tow ratings and lower GCVW is the clutch. People tend to burn out clutches when the tow heavy loads. Two things happen when most people drive a manual and pull a load. They REFUSE to use low gear to get things going (we are an impatient bunch). The other is..people think they have to SLIP the clutch to move slowly backing or starting, especially with a load. AGAIN..THATS WHY REVERSE IS SO LOW IN A MANUAL...FORD and other manufacturers recognize this. Most do not use the manuals in the way they are designed to be used. When loaded start out in LOW ..not 1st. VERY FEW DO IT...so most burn up clutches. One of my sons best friends works for a dealer as a mechanic. He sees new trucks with burned out manual clutes in heavy duty trucks in as little as 25,000 miles. They fry them because they are too lazy to use them correctly. I was tought many years ago by my father to NOT slip clutches..its eather in or out. I am 57 now. My last clutch in my F-250 lasted me 160,000 miles....and a great deal of that was pulling a heavy trailer. And that transmission was ONLY a 4 speed Borg Warner T-18 with NO OD. The one things that I cannot find out is the axel rating in the F-450 with the 4.88 rear. I don't see any indication anywhere or can't find out from my local Ford dealer. The 4.88 is probably the same 11,000# rating though. As its the same 4.88 rear used in the chasis cab 450 and 550. Thats another thing....this new F-450 is exactly the same truck as the 450 and 550 chassis cab with only two exceptions. Shorter wheel base and weaker and 8 inches longer rear springs. The frames rales are the same...the cross members vary but they vary in all heavy duties depending on the wheel base. The axels the same....and the 33,000# GCVW is the same for the F-450 pickup (4.88s) and it is with the f_450 and f-550 chassis cab...at 33,000# also. If you put the same spring package in the pickup...or air bags...they are identical...as far as frame down chassis.

 

ONE thing I forgot is the difference in HP between the two axel ratings. The 4.88 is 325 hp and 600 torque...while the 4.30 is 350 hp and 650 torque.

 

OMG..I am sorry guys....thats a pdf file...go to Fordvehicles.com...and click on fleet..then towing guides and you can get all this information.

 

So if you drive a manual transmition like your suppose to then it should have the same tow rating as the auto. Especially seeing how the manual is a much stronger transmision. So I should easly get 20K or more towing out of the manual. Unfortunatly the sticker on the truck will have the smaller GVW, which means if you get pulled over they will make you unload the trailer.
I still think that Ford is just trying to push the auto.
BTW the ford sight only has the 07 tow rating;
I got the tow rating info on:
http://www.sunrisefordfleet.com/pdfs/misc/2008%20Tow%20Guide.pdf
The F450 pickup does have a different frame than the chassis cab. The frame is wider. It also has a better tow rating then the chassie cab.

 

Why sure, but keep in mind we will be ruffing it. 37" wide screen TV, 22cubic in refer for the beer, leather reclining chairs, fireplace, and if I can figure out how to put the hot tub in the basement on the slide out shelf. Yep we will be rufffing it..