FAD override

[OneOffs10]

What does the tazer do?
I have an SAS s10 with gladiator axles, I cannot get the fad to work.
1. Does the FAD have to talk to a computer to function?
2. Has anyone converted their front axle to manual hubs?
3. If you have converted it to manual hubs, what manufacturer made the conversion kit?

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[81Mojave]

JK didn’t have a FAD besides the T-case.
Tazer idea would be cool, they seem to do the cool stuff we want (even if we didn’t know it yet)
It’s gonna be hard to get the Fad to work as designed. I guess it may be easier to figure out how to operate it by bypassing the sensors ( brain) in the FAD.

 

[HVYMETL]

I posted a question about this on some thread a while ago, but wondering if anyone has attempted (without a tazer) to find a way, with a simple switch, to override the FAD so that one can have a 2-LO option.

There are several instances for me where 2 LO is awesome. I have put the teraflex 2 LO kit in my 06 TJ, and LOVE it. But the JT does not have such an option and being under warranty I don't want to open up the T-case.

But if there is a way to override the FAD, without causing problems, I would be interested in knowing. Most roads near me are drivable by 2wd - but sometimes there are situations with a super tight switchback that low range makes it much easier on the engine/trans - but having it in 4-LO puts significant pressure on axles due to high traction road surfaces... So currently I either have to accept the risk of snapping an axle in order to have low range, or hear the hard struggle of the engine/trans going up some really steep switchback in order to not risk snapping an axle. As I put more weight on my JT, this is becoming a bigger and bigger concern.

You have my attention... I loved my 2 lo kit on my YJ. So much easier to steer sharp corners with out all the binding. Let us know what you come up with. I do have a Tazer and love it, well worth the money. And I to have pulled it without unmarrying it. No big deal, worked fine.

 

[chorky]

According to this diagram. The DTCM is expecting a locked/engaged signal and might throw a cel.

I wonder if anyone has any idea what type of 'signal' would be sent through G303 in the above photo. If its just a standard 12v connection there probably is a way to fake the module into thinking it is receiving a signal, while using a switch to open the G304 circuit, effectively allowing 2L by switching to low range, but not allowing the FAD to lock the axle together.

 

[Vtur]

I wonder if anyone has any idea what type of 'signal' would be sent through G303 in the above photo. If its just a standard 12v connection there probably is a way to fake the module into thinking it is receiving a signal, while using a switch to open the G304 circuit, effectively allowing 2L by switching to low range, but not allowing the FAD to lock the axle together.

It's Canbus signal. If i would have to guess, it functions are similar to the sway disconnect. There's probably a hall sensor that sense the actuator movement when engaged then relaying that signal back to the DTM. Interrupting any of those circuits connections/wires will throw a cel. An inline module simulating the engaged canbus signal would works tho.

 

[cranbiz]

I know that there is a harness for the Ram that allows you to engage 4 wheel drive while leaving the FAD disengaged but I have not seen one for the Gladiator.

If someone did come up with one, I would buy it in a heartbeat. 2 lo would be very useful in many situations.

 

[Volt0]

Rather than messing with the FAD, there might be an option to switch over to lockable hubs w/out replacing the entire front end. I’m not entirely sure on this, but I thought that I saw it somewhere.

 

[Rusty PW]

Rather than messing with the FAD, there might be an option to switch over to lockable hubs w/out replacing the entire front end. I’m not entirely sure on this, but I thought that I saw it somewhere.

Far as I know. No one has a locking front hub set up yet for this axle.

 

[chorky]

I know that there is a harness for the Ram that allows you to engage 4 wheel drive while leaving the FAD disengaged but I have not seen one for the Gladiator.

If someone did come up with one, I would buy it in a heartbeat. 2 lo would be very useful in many situations.

Oh do you happen to have a link? I wouldn't be surprised if the electronics side of things work the same way as the Gladiator!

ith the FAD, there might be an option to switch over to lockable hubs w/out replacing the entire front end. I’m not entirely sure on this, but I thoug

I know there is that option for those who go to larger axles. But I wouldn't want lockable hubs - ever again. That was actually my # 1 hate of the old 7.3. Constantly in and out. Body doesn't like that so much. It's a great idea - but not my thing. It's one of my all time favorite things on the TJ, being the first 4x4 I ever had with always engaged hubs. I do worry about the FAD strength over time but so far it doesn't seem to really be a weak point.

 

[cranbiz]

Oh do you happen to have a link? I wouldn't be surprised if the electronics side of things work the same way as the Gladiator!




I know there is that option for those who go to larger axles. But I wouldn't want lockable hubs - ever again. That was actually my # 1 hate of the old 7.3. Constantly in and out. Body doesn't like that so much. It's a great idea - but not my thing. It's one of my all time favorite things on the TJ, being the first 4x4 I ever had with always engaged hubs. I do worry about the FAD strength over time but so far it doesn't seem to really be a weak point.

Here is the kit.

https://us.bddiesel.com/products/2-...4wd-3500-2013-2019-4wd?variant=30073631604800

 

[Zachanadandy]

I’m not sure where you’ve heard that. The Tazer is quite a good product. And it does what you’re asking. Seems silly to write it off without even giving it a try.

As far as potential issues with 4wd, you should look up more information on what happens if the system detects a problem with the 4wd system. I have seen that there appear to be electronics in the process when it engages and if it thinks there’s a problem, it will tell you that it needs service and might not let you shift into 4wd anymore. I’ve seen a couple threads on here about people being unable to use 4wd until the dealer service is performed.

As far as my comment about choosing, that was really based around the Tazer. You either choose to tell it that the FAD is disconnected, or choose to tell it that it is connected. But you don’t get both. It’s meant to correct for those who do deletes, it’s not an on/off switch to flick while driving.

It’s one thing to do this switching while the vehicle isn’t running, like the Tazer does, but it’s some thing else to try to do it while it’s moving. It isn’t designed for that at all and will very likely cause problems. That’s why kits for the JK for 2Lo weren’t just some electronics change, it was actually a physical change.

You are totally free to try and figure it out though, and see what happens. But considering how concerned you are for your current warranty, I wouldn’t recommend it. The last thing you want to do is to try to trick the jeep in to doing some thing I can’t do and break something in the process.

The electronics involved in not allowing the 4wd to engage when the system sees an issue are the fad itself. The tcase linkage is mechanical. It's in or is out. If the system sees an issue, it can leave the fad open, disabling 4wd. Even in that scenario, you'd still have a 2LO option. When you disable the FAD with the tazer, does that leave it engaged or disengaged? Does it just leave it in whatever position it was in? That I don't know. Our 1st Gear combined with 4.56 axle gears has never once had me looking for 2lo, but I don't think it could be done seamlessly unless you deleted the fad via tazer, etc AND added a switch to make it still engage/disengage.

 

[chorky]

The electronics involved in not allowing the 4wd to engage when the system sees an issue are the fad itself. The tcase linkage is mechanical. It's in or is out. If the system sees an issue, it can leave the fad open, disabling 4wd. Even in that scenario, you'd still have a 2LO option. When you disable the FAD with the tazer, does that leave it engaged or disengaged? Does it just leave it in whatever position it was in? That I don't know. Our 1st Gear combined with 4.56 axle gears has never once had me looking for 2lo, but I don't think it could be done seamlessly unless you deleted the fad via tazer, etc AND added a switch to make it still engage/disengage.

Yeah tazer is an option but I'm looking to see if I can have that functionality without the tazer. I think last time I looked into it it's not a switchable function but more of a programing function meaning you have to go into the program mode to engage/disengage it. I think anyway. I would want something I can turn on/off by the switch of a button. In my area there are a lot of very tight, very steep switchbacks. Often times they do not require 4x4 (although rear axle lock would help); however, being in 4lo is a problem. Every time I either have to switch back into 2h and put extra strain on things by not having the reduced gearing of 4lo, or keep it in 4lo and get crazy wheel hop risking breaking an axle or u-joint. I absolutely love the 2lo option on my TJ and use it almost every time I go to the woods around here.

 

[rharr]

Here is the kit.

https://us.bddiesel.com/products/2-...4wd-3500-2013-2019-4wd?variant=30073631604800

Kit seems simple enough, now someone just need to locate the drive train control module on our jeeps and see if it's the same format, to work with this kit.

@DAVECS2 , do you have any insight on this, you are the local electrical/can bus guru.

 

[Volt0]

I know there is that option for those who go to larger axles. But I wouldn't want lockable hubs - ever again. That was actually my # 1 hate of the old 7.3. Constantly in and out. Body doesn't like that so much. It's a great idea - but not my thing. It's one of my all time favorite things on the TJ, being the first 4x4 I ever had with always engaged hubs. I do worry about the FAD strength over time but so far it doesn't seem to really be a weak point.

I totally hear ya on the lockable hubs. I’ve seen a few of these axle tubes come out, near the fad in some of the Trlm8r vids ( hence the aftermarket options to weld on a truss ). My sense was that some folks would switch over to chromoly shafts, one of the options is to bypass the fad, in which case you might want lockable hubs. So, just throwing this out there as an alternative solution depending on your needs.

I guess you could reach out to the folks that sell those chromoly shafts, and see what products they have to disable the fad during their install.

 

[chorky]

uld reach out to the folks that sell those chromoly shafts, and see what products they have to disable the fad

I thought the stock axles on the rubicon are chromoly - or maybe that's just the rears?

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