Locking hubs.. take my money!

[DanJT]

A lot in here have been asking about this....


I'm going to check on this!

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[JTdiRtyD]

A lot in here have been asking about this....


I'm going to check on this!

You have a 2020 so you should have a FAD. Are you having problems with it? Otherwise why manual hubs?

 

[LouisvEarlleJT]

I kind of enjoy not having to jump out of the truck to lock in.

 

[DanJT]

You have a 2020 so you should have a FAD. Are you having problems with it? Otherwise why manual hubs?

I grew up with locking hubs, as well.as the air operated disconnects failing in the 90's as well as many, many posts of fad's failing . My fad works fine but I actually prefer the piece of mind of a manual.

 

[Sweetums]

Interesting, I didn't realize they were shipping with CVs and no FAD now.

 

[JTdiRtyD]

I grew up with locking hubs, as well.as the air operated disconnects failing in the 90's as well as many, many posts of fad's failing . My fad works fine but I actually prefer the piece of mind of a manual.

Fair enough. I too grew up with manual hubs, but the FAD is simple enough that if it fails you can pop the cover and manually lock/unlock it in a pinch. It's not a trip breaker by any means.

 

[Blade1668]

A lot in here have been asking about this....


I'm going to check on this!

I'm not surprised Mile Marker (or Warn) hasn't came out with it, they made them for the XJ, MJ, & YJ axles in the past then faded out with many doing axle swaps. The late XJ's (and ones with 242 T-case) and TJ's didn't have the (former named CAD) FAD.
Do I see a good reason for this yes, if you are driving hundreds of road miles less wear on front drive line increase in fuel economy likely. Even with the FAD most of the drive line is still spinning.

 

[Sweetums]

I could also see this as an option for all four wheels if doing a lot of flat towing. Put locking hubs all around and nothing is moving but the wheels and bearings. (Just remember to lock your rear hubs before trying to drive off)

 

[bgott]

I had a ‘06 Ram 2500. No locking/ unlocking hubs, no FAD. No crawling out in a mud hole, no added mechanical complexity, no bullshit vacuum hubs. No problem! What does the FAD give you, a quarter horsepower and a quarter MPG? Many of us screw off more than that by adding oversized tires right off the bat!

 

[Sweetums]

I had a ‘06 Ram 2500. No locking/ unlocking hubs, no FAD. No crawling out in a mud hole, no added mechanical complexity, no bullshit vacuum hubs. No problem! What does the FAD give you, a quarter horsepower and a quarter MPG? Many of us screw off more than that by adding oversized tires right off the bat!

It also cuts down on wear and tear since you end up pushing the front powertrain along even if it's not driven. Manual locking hubs do the same job, but people like to operate everything from inside - and it's pretty nice to be able to put it in 4WD in the middle of a snow storm without having to tromp around on the shoulder while traffic skids by.

 

[CrazyCooter]

Pass.........UNLESS you have a rig without the FAD and lifted it too much?

The 2024+ guys who have already reported vibrations after lifting will definitely be thankful for this mod though. I'm surprised (or not) that it took so much parts swapping to figure out the source of the vibration though? Basic first year 4x4 Cardan joint driveline angle theory at work here.

The big question is: What is the absolute lift height vs caster angle vs driveline speed that can be tolerated before running into issues?

 

[D_JT]

Just convert to a one piece shaft and be done with it. No need for a fad or locking hubs.

 

[CrazyCooter]

Just convert to a one piece shaft and be done with it. No need for a fad or locking hubs.

You didn't comprehend the problem is with the vibration that is caused by the driveline constantly turning at high speeds after a suspension lift......NOT THE FAD itself. What you have suggested it to delete an existing FAD which is the problem the 2024+ JT's now have from the factory as they not longer have a FAD.

Adding the hubs stops the front drivetrain from turning.

 

[Sweetums]

Pass.........UNLESS you have a rig without the FAD and lifted it too much?

The 2024+ guys who have already reported vibrations after lifting will definitely be thankful for this mod though. I'm surprised (or not) that it took so much parts swapping to figure out the source of the vibration though? Basic first year 4x4 Cardan joint driveline angle theory at work here.

The big question is: What is the absolute lift height vs caster angle vs driveline speed that can be tolerated before running into issues?

The FAD has nothing to do with the lift because Solid Axle. The FAD is mounted entirely on the axle itself - that thing could be three feet below the chassis and it wouldn't care. In the video he explains the lack of disconnect causing the front end of the powertrain to turn is causing the noise (normal for turning machine parts) and vibration (probably due to bad front pinion angle and drive shaft geometry). The vibration for the lift isn't present with a FAD because if the front axle is engaged you are probably in 4WD and running lower speeds over dirt, resulting in no high speed vibration or not noticing it due to the terrain.
The FAD is doing a similar job to freespooling hubs, preventing the front driveline from turning when not engaged by the transfer case. The FAD is preventing vibration and noise at speed, not causing it.

 

[CrazyCooter]

The FAD has nothing to do with the lift because Solid Axle. The FAD is mounted entirely on the axle itself - that thing could be three feet below the chassis and it wouldn't care. In the video he explains the lack of disconnect causing the front end of the powertrain to turn is causing the noise (normal for turning machine parts) and vibration (probably due to bad front pinion angle and drive shaft geometry). The vibration for the lift isn't present with a FAD because if the front axle is engaged you are probably in 4WD and running lower speeds over dirt, resulting in no high speed vibration or not noticing it due to the terrain.
The FAD is doing a similar job to freespooling hubs, preventing the front driveline from turning when not engaged by the transfer case. The FAD is preventing vibration and noise at speed, not causing it.

What more can I say...... Is this some common core math exercise?

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