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View Full Version : VIDEO - JL JOURNAL : Understanding the FAD - How the JL Front Axle Disconnect Works



wayoflife
03-01-2019, 12:50 AM
In an effort to help improve fuel economy on the all new JL Wrangler, Jeep went through great lengths to lighten up it up as much as they could, reduce drag where possible and make it operate more efficiently. Of course, one of the things they did to help make this possible was to add a front axle disconnect or what most people refer to as, an FAD. But, what exactly is an FAD and how does it work? Is it tied into the JL computer and what if you were to upgrade your axle to something like a ProRock 44? Will getting rid of it be a problem? In this episode of the JL JOURNAL, Jim McGean, the owner of Dynatrac will answer all these questions and more. We hope you enjoy and find the information to be useful.


https://youtu.be/CzNBai41kZc

This is the 2nd in a series of JL JOURNAL's that we've made to help educate people about JL Wrangler axles and why you might want to consider a Dynatrac ProRock 44. We hope that you'll find them to be informative. Please check back soon for our next installment.

PLEASE SUBSCRIBEIf you enjoyed this video, Cindy and I would be grateful if you could please SUBSCRIBE to our YouTube channel!
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Ddays
03-01-2019, 01:25 AM
Very helpful. I had a pretty good idea how this worked but now I can see how it works. These videos are great!

wayoflife
03-01-2019, 01:28 AM
Very helpful. I had a pretty good idea how this worked but now I can see how it works. These videos are great!
Awesome! We're so glad that we can share some of what we've been learning :)

jeeeep
03-01-2019, 01:34 AM
like all other "FAD"(s) hopefully this one will be short lived :icon_crazy:

wayoflife
03-01-2019, 01:35 AM
like all other "FAD"(s) hopefully this one will be short lived :icon_crazy:

:cheesy: yes, let's hope it's short lived indeed :D

wjtstudios
03-01-2019, 01:49 AM
Really interesting to see how that actually worked in an honest advantage/disadvantage discussion. As always, Nicely done!

wayoflife
03-01-2019, 01:52 AM
Really interesting to see how that actually worked in an honest advantage/disadvantage discussion. As always, Nicely done!

Thank you. All we would hope to do is share what we learn with others like you. :yup:

notnalc68
03-01-2019, 02:28 AM
Too bad most people canít figure out locking hubs. I guess, as Jim said, the FAD may be cheaper.


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wayoflife
03-01-2019, 02:31 AM
Too bad most people canít figure out locking hubs. I guess, as Jim said, the FAD may be cheaper.

I think the bigger issue is that people are lazy. Most don't want to get out in the weather or the muck just to have 4WD. They just want to push a button and go. And really, I totally get it or at least, for most people. For us, Jeepers, it sucks to not have.

Andy5160
03-01-2019, 02:41 AM
Very nice and informative [emoji106][emoji106]
Is that your new axle being made at the end of the video[emoji848][emoji848]


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Suds1485
03-01-2019, 02:51 AM
I have no sound so I didnít watch the video right now. But based on what it looks like it reminded me of the vacuum disconnect on the xj in the 80ís is it the same concept? And if so how does it fair for over strength? Is it a new weak point. Sorry if these were addressed in the vid. I wonder if this is just a modern retry of an old technology.


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TrailHunter
03-01-2019, 03:12 AM
Seems Logical. [emoji51]

benatc1
03-01-2019, 03:48 AM
Good informative short video, always appreciate Jim's expertise

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jesse3638
03-01-2019, 04:07 AM
Too bad most people canít figure out locking hubs. I guess, as Jim said, the FAD may be cheaper.


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I think the bigger issue is that people are lazy. Most don't want to get out in the weather or the muck just to have 4WD. They just want to push a button and go. And really, I totally get it or at least, for most people. For us, Jeepers, it sucks to not have.
Yeah I wish we had manual locking hubs on the JK. Due to front drive shaft failures we installed them on our old fire engines. It was awesome to completely disengage everything from spinning. I remember the first "on the fly" push button 4wd ads.


Question I have speaking of "on the fly" 4wd. If the axle shafts are spinning opposite directions when the FAD is in 2wd do you have to come to a complete stop to shift to 4wd on the JL?

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piginajeep
03-01-2019, 05:16 AM
Cool video. I canít believe how big that is hanging off the axle 😳

wayoflife
03-01-2019, 05:18 AM
Very nice and informative [emoji106][emoji106]
Is that your new axle being made at the end of the video[emoji848][emoji848]

As a matter of fact, this whole video series highlights the PR44JL that was being made for Jet :yup:


I have no sound so I didnít watch the video right now. But based on what it looks like it reminded me of the vacuum disconnect on the xj in the 80ís is it the same concept? And if so how does it fair for over strength? Is it a new weak point. Sorry if these were addressed in the vid. I wonder if this is just a modern retry of an old technology.


Yup, same thing as the old CAD from long ago only, instead of using vacuum to make it work, there is an electrical motor. Is it a weak point? Well, so far, it hasn't been or at least in terms of how it works.


Good informative short video, always appreciate Jim's expertise

Glad to hear you found this video to be informative. We always love working with Jim being that he has so much knowledge to share. :yup:


Yeah I wish we had manual locking hubs on the JK. Due to front drive shaft failures we installed them on our old fire engines. It was awesome to completely disengage everything from spinning. I remember the first "on the fly" push button 4wd ads.


Question I have speaking of "on the fly" 4wd. If the axle shafts are spinning opposite directions when the FAD is in 2wd do you have to come to a complete stop to shift to 4wd on the JL?


Good question and the answer is no. There is a syncro in the transfer case that helps the FAD understand when it can engage. This is the reason why there was a lot of concern early on regarding what it would mean to get rid of the FAD.

wayoflife
03-01-2019, 05:19 AM
Cool video. I canít believe how big that is hanging off the axle 😳

It's why skids are being made that go over the skid that comes from the factory :crazyeyes:

fiend
03-01-2019, 06:27 AM
Good informative video.

If the FAD is as reliable as the JKR electronic sway bar, Dynatrac is going to make a bunch of money selling a manual ďno limitsĒ FAD knob.


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jdofmemi
03-01-2019, 02:40 PM
Good informative video.

If the FAD is as reliable as the JKR electronic sway bar, Dynatrac is going to make a bunch of money selling a manual ďno limitsĒ FAD knob.


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I see a delete kit, with one piece axle shafts and something to convince the computer that everything is OK

jesse3638
03-01-2019, 02:51 PM
I see a delete kit, with one piece axle shafts and something to convince the computer that everything is OK
Yeah I can see that too. I wonder if "deleting" it and bolting or welding a 3/16-5/16" plate in its place would do anything for strength there.

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wayoflife
03-01-2019, 02:58 PM
Good informative video.

If the FAD is as reliable as the JKR electronic sway bar, Dynatrac is going to make a bunch of money selling a manual ďno limitsĒ FAD knob.


I see a delete kit, with one piece axle shafts and something to convince the computer that everything is OK

What Jerry said. There are already 1-piece kits available now and I'm sure more are coming. A Tazer will be able to bypass the FAD too.


Yeah I can see that too. I wonder if "deleting" it and bolting or welding a 3/16-5/16" plate in its place would do anything for strength there.


I somehow doubt it but I'll bet someone comes out with something like it and or it being part of a truss.

Outrun
03-01-2019, 05:14 PM
Excellent video!

Considering what Jeep does with everything else on the Rubicon you would think they'd just put some manual hubs on there. Save us all money in the long run.:crazyeyes:

cozdude
03-01-2019, 05:18 PM
Very informative! Was always wondering what would happen if you got rid of the fad and how the computer would react. Glad to know you donít need to do anything with the t case as well like dynatrac initially thought

Brute
03-01-2019, 06:13 PM
Informative and concise...mahalo

wayoflife
03-01-2019, 09:49 PM
Excellent video!

Considering what Jeep does with everything else on the Rubicon you would think they'd just put some manual hubs on there. Save us all money in the long run.:crazyeyes:

I'm pretty sure Jeep did it for the bulk of people who'll buy even a Rubicon and never use it for what it's capable of. Most people who will use 4WD at sometime or another even have a hard time with shifting the transfer case.


Very informative! Was always wondering what would happen if you got rid of the fad and how the computer would react. Glad to know you donít need to do anything with the t case as well like dynatrac initially thought

It really is a good thing too. If that were the case, it would have made doing an axle swap a lot more time consuming and expensive.


Informative and concise...mahalo

Glad to hear it :)

fiend
03-01-2019, 10:38 PM
I'm pretty sure Jeep did it for the bulk of people who'll buy even a Rubicon and never use it for what it's capable of. Most people who will use 4WD at sometime or another even have a hard time with shifting the transfer case.

Right? We should be thankful Jeep still makes them with a TC lever and not just a button on the dash like most 4wd vehicles these days.



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wayoflife
03-01-2019, 11:23 PM
Right? We should be thankful Jeep still makes them with a TC lever and not just a button on the dash like most 4wd vehicles these days.


That's how it's like on pretty much every other Jeep made including the Cherokee. The fact that we still have a mechanical transfer case lever is nothing short of amazing to me.

nbunga
03-01-2019, 11:33 PM
That's how it's like on pretty much every other Jeep made including the Cherokee. The fact that we still have a mechanical transfer case lever is nothing short of amazing to me.

As far as I know the wrangler is the only vehicle left with the T/C lever. In the states at least.

wayoflife
03-02-2019, 12:07 AM
As far as I know the wrangler is the only vehicle left with the T/C lever. In the states at least.

That was my thought as well but I wasn't 100% sure.

jdofmemi
03-02-2019, 01:26 AM
Give me a lever. At least when you are a hundred miles from nowhere, you can fix it when it don't work.

I would rather have hubs too. Give me options so I can get back when things go wrong.

wayoflife
03-02-2019, 03:08 AM
Give me a lever. At least when you are a hundred miles from nowhere, you can fix it when it don't work.

I would rather have hubs too. Give me options so I can get back when things go wrong.

I hear ya. It actually frustrates me that the automatic shift lever on the JL is drive by wire. :rolleyes2:

jdofmemi
03-02-2019, 03:20 AM
I hear ya. It actually frustrates me that the automatic shift lever on the JL is drive by wire. :rolleyes2:

It also don't seem right how the manual shift mode is either.

In the JK, right and left to shift, then if you need reverse, especially in a hurry, it is straight forward.

Now, on the JL, you have to move the lever to the side for manual, then if reverse is needed, you have to go back to the auto mode before moving forward to reverse.

If you were in a bad spot, and need reverse NOW, it will not be easy.

piginajeep
03-02-2019, 06:49 AM
I hear ya. It actually frustrates me that the automatic shift lever on the JL is drive by wire. :rolleyes2:

More reason to go 6 speed on the JT 😀

firejeeper
03-02-2019, 07:07 AM
Great video. I wish someone would design manual hubs for the JK and JL. I think there would be a market for it.


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wayoflife
03-02-2019, 03:19 PM
More reason to go 6 speed on the JT 😀

LOL!! Still considering it but may just get whatever we can get if it means we can get it sooner. :yup:


Great video. I wish someone would design manual hubs for the JK and JL. I think there would be a market for it.

Actually, there are companies that already make and sell kits. They just cost a small fortune.

firejeeper
03-02-2019, 04:43 PM
Your right. I had just assumed that they werenít out there because I havenít seen any or heard about it. You know what they say about assume.


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rubiDave
03-02-2019, 06:15 PM
I'm enjoying all of your JL videos, even though I'll probably never own one. I think it's good to stay abreast of technology and other improvements. I average about 20 years between vehicles. My 2014 JK is a big come-upance electronics wise from my 99 Chevy, as it was from my 76 Ramcharger. Who knows what's going to be around in the 2030s, though by then I may be looking for a hoveround.

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blacker1
03-04-2019, 06:32 PM
Another great video on how things work inside of these axles, thanks again for sharing them!

wayoflife
03-04-2019, 07:34 PM
Awesome, glad you guys are enjoying the series :)