FAD override

[chorky]

To avoid codes/cel issues in pretty store you'd need a tazer pr scan to delete the fad and then just add a switch to use the fad manually.

I was not talking about deleting the fad. I was looking at a T-case selector like the one linked to for the TJ that utilizes the low gearing, but does not engage the front drive shaft. But I have not seen the inside of the JT T-case to see if it can be worked that way or not. I would think it can but I dont know for sure.

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[rharr]

You could try this, might work for JEEP

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

 

[Zachanadandy]

I was not talking about deleting the fad. I was looking at a T-case selector like the one linked to for the TJ that utilizes the low gearing, but does not engage the front drive shaft. But I have not seen the inside of the JT T-case to see if it can be worked that way or not. I would think it can but I dont know for sure.

I think the electronics and the fad make it far more simple though? Delete the fad from the computer so it's not looking for it and add a simple 12v switch to engage and disengage it. Full functionality, full control, and a computer that doesn't see a problem for >$400. Seems like a win win to me. Put the tcase in any gear you want and have full control of the front axle.

 

[chorky]

I think the electronics and the fad make it far more simple though? Delete the fad from the computer so it's not looking for it and add a simple 12v switch to engage and disengage it. Full functionality, full control, and a computer that doesn't see a problem for >$400. Seems like a win win to me. Put the tcase in any gear you want and have full control of the front axle.

It is, and I totally forgot about the option @rharr linked to as well. So I'll look into that some more. It would be the simplest method for sure.

 

[WILDHOBO]

It is, and I totally forgot about the option @rharr linked to as well. So I'll look into that some more. It would be the simplest method for sure.

I’m late to the party. What problem are you trying to solve by adding rear 2 low?

 

[chorky]

I’m late to the party. What problem are you trying to solve by adding rear 2 low?

Quite a lot of the roads I take around here just on evening/weekend drives have some steep tight switchbacks which are best done in low range. But, having it in 4wd is a disadvantage that causes either wheel hop or multiple point turns on a switch back. I have 2 lo in my TJ and it is the best ever mod I have invested in. Makes for good slow maneuvering on tight steep sections of road without having to do a multi-point tun to avoid driveline binding.

 

[WILDHOBO]

Quite a lot of the roads I take around here just on evening/weekend drives have some steep tight switchbacks which are best done in low range. But, having it in 4wd is a disadvantage that causes either wheel hop or multiple point turns on a switch back. I have 2 lo in my TJ and it is the best ever mod I have invested in. Makes for good slow maneuvering on tight steep sections of road without having to do a multi-point tun to avoid driveline binding.

Got it. FWIW, I have zero wheel hop with cv axles. Both the Oem mopar and the RCVs are perfect in that way. But I can totally see the want to just not use that front driveshaft when not needed. Offroad towing comes to mind.

 

[chorky]

Got it. FWIW, I have zero wheel hop with cv axles. Both the Oem mopar and the RCVs are perfect in that way. But I can totally see the want to just not use that front driveshaft when not needed. Offroad towing comes to mind.

I use it all the time in my TJ. It is super convenient. I've never had bad wheel hop but definitely get driveline binding pretty bad with the switchbacks here.

 

[WILDHOBO]

I use it all the time in my TJ. It is super convenient. I've never had bad wheel hop but definitely get driveline binding pretty bad with the switchbacks here.

I can see that being pretty cool.

 

[chorky]

Had a chat with the guys over at BD today. They are in the process of re-doing their FAD override for Ram trucks. There was some type of error they had in the past. So in the process, they are going to see if the same system will also work on a JL/JT. Might be a couple months, but anyone else interested in a 2Lo option stay tuned. I will buy it the second it becomes available.

In the mean time, do not buy their existing kit as it has an unknown issue they are resolving right now. I am hoping the modules and FAD function on a JL/JT are the same as a Ram truck - meaning the kit is a direct fit. We'll see.

 

[ssrlewis]

Any update?


Steve

 

[Supazuk]

sorry to drag this back from the grave, I was researching this and found over on the JL forum some has figued out that PIN 2 on the FAD is the Ground signal for selection and it can be interupted via a relay connected to aux switch:
https://www.jlwranglerforums.com/forum/threads/how-to-manually-control-the-fad.42710/page-3

 

[kevman65]

Okay, if I understand this all correctly, you want to cause the FAD to be disconnected while the JT is in 4LO.

Well, in my simple brain, this won't give you 2LO, you'll have 3LO and a hell of a pull to the left.
The FAD has nothing to do with the front axle being powered, it just locks the two sides together when in 4WD.

Your work needs to be concentrated on the transfer case.

 

[ShadowsPapa]

Okay, if I understand this all correctly, you want to cause the FAD to be disconnected while the JT is in 4LO.

Well, in my simple brain, this won't give you 2LO, you'll have 3LO and a hell of a pull to the left.
The FAD has nothing to do with the front axle being powered, it just locks the two sides together when in 4WD.

Your work needs to be concentrated on the transfer case.

If the FAD is disconnected with t-case in 4H or 4L, the front won't drive because the right inner axle half will simply spin in the housing. You'd have to engage the locker to prevent that, and then you'd have 3 wheel drive.

 

[Supazuk]

the FAD to be disconnected while the JT is in 4LO.

Well, in my simple brain, this won't give you 2LO, you'll have 3LO and a hell of a pull to the left.
The FAD has nothing to do with the front axle being powered, it just locks the two sides together when in 4WD.

Your work needs to be concentrated on the transfer case.

you do not understand correctly nor understand a differential axle with spider gears ... had to edit, my inner PBB mod came out and I started to mean flame.. but I want to be nice and understand not everyone here has torn down a axle and knows how they work...so.........
Explanation:
With spider gears it it 2 low and will not power the axle, the spider gears would rotate and not give power as there is no apposing force on the driven axle.
In my case with,I have a lunch box locker it will be intermittent 2 to 3 but allow better turns in 2low as the still driven axle would allow it to separate and not be forced into a driven situation ( if you break an axle with a lunch box the drive is rendered useless unlike a locker or a spool)

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