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Nov 10, 2021 | 01:32 PM

wizardfitz

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Mountain Pass

Joined: Feb 2011

Posts: 101

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From: Indiana

axle question

Building a 22 f250 lariat 4x4 Supercrrw 8ft bed, 7.3 engine. Comes with 3.55 gears, if I add fx4 it changed gears to 4.60.
Why? Benefits?
Will not be towing.

Nov 10, 2021 | 01:37 PM

Ltngdrvr

Lead Driver

Joined: Nov 2005

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There is no 4.60 ratio, there is 4.30.
Lower ratio is good for offroad use, better if you plan to lift and add taller tires.
Never spec'd a gas engine truck myself, don't know why that package would force the lower ratio on it.

Nov 10, 2021 | 02:33 PM

shawnee1

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Joined: Jul 2019

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The FX4 package requires the electronic locking rear axle. For the 7.3 I think it is either a 3.55 or a 4.30. If you don't select an electronic locking the build defaults to the 4.30 for the FX4 package but you can change it to the 3.55 or select the 3.55 electronic locking before selecting the FX4 package.

Nov 10, 2021 | 03:20 PM

wizardfitz

Thread Starter

Mountain Pass

Joined: Feb 2011

Posts: 101

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From: Indiana

that worked thanks

Nov 10, 2021 | 05:09 PM

05F250DSL

Fleet Mechanic

Joined: Sep 2013

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Quote:

Originally Posted by wizardfitz

Building a 22 f250 lariat 4x4 Supercrrw 8ft bed, 7.3 engine. Comes with 3.55 gears, if I add fx4 it changed gears to 4.60.
Why? Benefits?
Will not be towing.

as far as benefits 4.30’s will give better acceleration, as mentioned if you plan on bigger tires it’s not a bad idea. You will have more smiles with the lower ratio and reports on mpg have been little difference between the two.

Nov 10, 2021 | 06:04 PM

Sox3

Mountain Pass

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From: Newark, Delaware

Nov 10, 2021 | 06:21 PM

akajones

Senior User

Joined: Apr 2020

Posts: 121

Likes: 52

I ordered 4.30s, but the truck does turn some serious Rs at highway speeds. More engine wear from Rs with the higher speeds is a small downside. I was willing to make that trade. These trucks have plenty of power for either ratio IMO.

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Nov 10, 2021 | 08:03 PM

Johnny Paycheck

Fleet Mechanic

Joined: Jul 2019

Posts: 1,306

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Quote:

Originally Posted by akajones

I’m not sure you’re getting any wear at all as far as higher RPMs. These newer fuel injection setups are so precise, it’s not like the old days of pumping gas pedals to prime carbs and washing oil off cylinder walls. A few extra revs may have that oil pump moving a bit more oil where it needs to go.