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Dec 25, 2017 | 04:13 PM

#16

Tom

Super Moderator

Joined: Aug 2003

Posts: 25,479

Likes: 742

From: Isanti, MN

Quote:

Originally Posted by Buliwyf

Yeah,I read that, just never believed it. I remember the ESOF F150's grinding when the vacuum system failed. My previous trucks were XL manuals. So I follow about the same routine with the ESOF on the '17.

The F150's hubs are a completely different design than what's used in a Super Duty. Those require the application of continuous vacuum to keep the hubs unlocked. The Super Duty hubs use a certain vacuum application to engage, and another application of a different pressure to disengage.

I've attached a .pdf file of the system's operation and diagnosis as it applies to an '04. Lots has changed on the '17+ models, but I *think* the 4WD system operates in the same fashion.

Attached Images

Four Wheel Drive Systems - Electronic Shift Testing.pdf (1.04 MB, 59 views)

Dec 25, 2017 | 07:25 PM

#17

00t444e

Logistics Pro

Joined: May 2017

Posts: 3,523

Likes: 483

From: Southern OH

Quote:

Originally Posted by willynilly

i think ford or dana could put their heads together and find a better and more reliable 4x4 system. with vacuum hubs and electric motor on the tcase it just leaves to much room for something to go wrong imo

They did make a more reliable system with the manual shift transfer case and manual locking hubs. I don't think they offer the manual 4x4 on the newer trucks. The general public would rather have something convinent than something reliable.

Dec 25, 2017 | 07:43 PM

#18

Tom

Super Moderator

Joined: Aug 2003

Posts: 25,479

Likes: 742

From: Isanti, MN

Quote:

Originally Posted by 00t444e

It is 2017, ya know. We can have both.

Dec 25, 2017 | 08:12 PM

#19

theboom

Tuned

Joined: Mar 2016

Posts: 464

Likes: 29

I know this doesn't help and I don't say this to be an a** but I never shift into 4wd at anything but 0mph.

Dec 25, 2017 | 08:14 PM

#20

00t444e

Logistics Pro

Joined: May 2017

Posts: 3,523

Likes: 483

From: Southern OH

Having a vacuum or electronics to engage the hubs and transfer case will never be as reliable as doing it manually. I just lock my hubs before I leave if I think I am going to need 4x4 where I'm going, then I just shift into 4x4 when I need it.

Dec 25, 2017 | 08:55 PM

#21

Buliwyf

Posting Guru

Joined: Dec 2017

Posts: 1,441

Likes: 8

Quote:

Originally Posted by theboom

I know this doesn't help and I don't say this to be an a** but I never shift into 4wd at anything but 0mph.

+1. I was the same way for a long time. And the "transfer case makes weird noises at 60mph in 4wd" threads are cracking me up. I always get out of 4wd as soon as I can. I never need it past 20mph.

My last truck was all manual. I went with ESOF this time. Try something new. The xfer case motor seems easy to get to. I haven't heard of the ESOF's failing much around here, give or take the hubs, that can be locked.

Dec 25, 2017 | 09:15 PM

#22

J Standard

Senior User

Joined: Dec 2017

Posts: 282

Likes: 2

Quote:

Originally Posted by 00t444e

It is a $0 option for 2018 XL Super Duty's.

The general public is to stupid to actually lock in hubs and shift a lever...

Dec 25, 2017 | 09:26 PM

#23

longview1

Banned

Joined: Jan 2003

Posts: 1,457

Likes: 0

From: Grande Prairie, AB

I have no worries shifting into/out of 4h at speeds. In both my personal trucks as well works trucks. My 2008 would sometimes make an audible clunk.
I do let off throttle when engaging/disengage, but anywhere between 80-100kmh I do on a daily basis.

My personal opinion is to not have any torque on the drivetrain while shifting...
We don’t all live and drive in ideal conditions where getting in/out of a vehicle on a hwy is safe and/or convenient everytime ya wanna be in 4x4!

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Dec 25, 2017 | 09:28 PM

#24

USSenator

Elder User

Joined: Apr 2017

Posts: 523

Likes: 0

From: Eagan, MN

If the road conditions require 4WD, they also require speeds less than 60...

Dec 25, 2017 | 09:52 PM

#25

willynilly

Cargo Master

Joined: Jan 2017

Posts: 2,253

Likes: 563

if a 4x4 system cant be enaged at fairly high speeds then its useless as far as im concearned. ive
had to engage mine at 50mph more times than i can remember

Dec 26, 2017 | 06:14 AM

#26

J Standard

Senior User

Joined: Dec 2017

Posts: 282

Likes: 2

Quote:

Originally Posted by longview1

This

As for those that complain about the whine you have to realize there is a chain in the transfer case spinning really fast right under your seat.

Dec 26, 2017 | 06:48 AM

#27

Devildog95

Junior User

Joined: Jul 2017

Posts: 50

Likes: 1

Whine

Whining in mine is in-sync with acceleration/deceleration with a metallic type humming. No issue with clunk or loud noises. Different than previous fords. Riding with a ford mechanic this morning to try and pinpoint it.

Dec 26, 2017 | 07:57 AM

#28

USSenator

Elder User

Joined: Apr 2017

Posts: 523

Likes: 0

From: Eagan, MN

Quote:

Originally Posted by Buliwyf

+1. I was the same way for a long time. And the "transfer case makes weird noises at 60mph in 4wd" threads are cracking me up. I always get out of 4wd as soon as I can. I never need it past 20mph.

You must not have remembered the part when your physics teacher said "The laws of physics do not apply once you are in four-wheel drive".

There is something about "An object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force", that makes me nervous when people pass me in the snow on the highway.

Dec 26, 2017 | 09:09 AM

#29

RainDesert

Cargo Master

Joined: Jan 2015

Posts: 2,824

Likes: 39

From: Boise

Quote:

Originally Posted by Devildog95

You describe mine too, I am curious what the tech says. Thanks

Dec 26, 2017 | 10:31 AM

#30

River Wild

Fleet Mechanic

Joined: May 2017

Posts: 1,760

Likes: 388

From: Oregon

Quote:

The general public is to stupid to actually lock in hubs and shift a lever...

It has nothing to do with stupidity... it's about convenience for some so why wouldn't a manufacturer not offer it? One might argue there is some laziness mixed in there somewhere as well.

I find it ironic that some manufacturers would ask, "Hubs? What are hubs? our system has no hubs."

It's obvious to me, many here have no idea how to use the 4wd system based on the comments that are typed above. I'm now wondering who are the stupid ones...

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