F-450 rear end gears - Diesel Forum - TheDieselStop.com
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Old 02-08-2006, 11:23 AM   #1 (permalink)
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F-450 rear end gears

I have an F-450 (2003 7.3 2wd 6 speed)with the std 4.88 open rear end. My dealer tells me there are no optional gear sets available through Ford. The truck is rated to pull 16k lbs approx, I don't go over 10k, so the extra gear is hurting economy and not being utilized.

Does anyone know of options outside of Ford? Who manufactures these rear ends, Ford says they are specific for the F-450.

Thanks in advance for any help.
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Old 02-08-2006, 11:47 AM   #2 (permalink)
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Re: F-450 rear end gears

There is a complete rear end for an F350 on ebay right now for $850. You might email the seller and find out the ratio.
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Old 02-08-2006, 12:22 PM   #3 (permalink)
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Re: F-450 rear end gears

What size is the rear end. You might try Richmond Gear
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Old 02-08-2006, 01:01 PM   #4 (permalink)
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Re: F-450 rear end gears

[ QUOTE ]

Does anyone know of options outside of Ford? Who manufactures these rear ends, Ford says they are specific for the F-450.

[/ QUOTE ]

Well, the F450 is available from Ford with either the stock 4.88:1 or optional 4.30:1 gears so your dealer needs to look at the order sheets. Also, the axles are standard Dana 80's (unless something has changed recently) so you can go to pretty much any axle shop and swap in any gearset that'll fit. Going to a 4.10:1 or higher requires new carriers, but 4.30:1 will definitely fit in what you've got.
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Old 02-09-2006, 07:25 AM   #5 (permalink)
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Re: F-450 rear end gears

[ QUOTE ]
My dealer tells me there are no optional gear sets available through Ford.

[/ QUOTE ]

That wasn't a dealer - that was an uninformed nincompoot. [img]/ubbthreads/images/graemlins/frown.gif[/img]

The 4.88 ratio was standard in a 2003 F-450, but a 4.30 ratio was optional. So your Ford dealer can definitely get you the parts to change it to 4.30.

[ QUOTE ]
Who manufactures these rear ends, Ford says they are specific for the F-450.

[/ QUOTE ]

Around 2003 Ford was experimenting with rear ends for the F-450. Before that and after that they have a heavy-duty Dana 80 rear end with a fancy diff cover. Similar to the Dana 80 diff in the F-350 DRW except for the diff cover. But right about then Ford put the new Dana Spicer-110 rear end in some F-450s. So yours might be either the Dana 80 or the Dana S-110. But in either case, 4.30 ratio was optional.

And BTW, a Dana 80 from a pickup won't work. If you can find one from an F-350 chassis cab, that will work. But a pickup frame is wider than a chassis cab frame, so you can't install a rear axle from a pickup without a lot of fabrication, skinned knuckles, and curse words. [img]/ubbthreads/images/graemlins/smokin.gif[/img]
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Old 02-09-2006, 09:44 AM   #6 (permalink)
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Re: F-450 rear end gears

As above, plus I have a '00 450 4x4 that came with 4.88s. To change to 4.30s, I had to change a (front I think) carrier to go with that ratio. Otherwise, IF you have the Dana80HD (don't know about the 110) there are a lot of gearsets available. Buying one from the dealer just means you will be getting the same thing for twice the price. I pull a 26k trailer, and find that I can walk off in OVERDRIVE (0.8555 x. 4.30 = 3.67 equivalent) and low gear with the 4.30s on level ground at idle, grossing 36k - so it tells you how ridiculous the 4.88s were in the first place. If you have a 2WD truck, I would look seriously at 4.10, 3.90 or even 3.73 (will need carriers).

Pat
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Old 02-10-2006, 11:50 AM   #7 (permalink)
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Re: F-450 rear end gears

Thanks for all the input guys.
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