Regeared, now front driveshaft spins in 2WD

[JTCamp]

Hey! New to the forum and what’s a better ice breaker than asking strangers for advice?

So I picked up my 24 JT Rubicon from a “reputable” Offroad shop on Friday after they regeared me to 4.88’s. On the drive home I had a noticeable whine from the front while coasting. Now today during freeway break-in I felt and heard a hum coming from the front and into the gas pedal. I came to the conclusion while driving that it felt as if the front driveshaft was spinning. So when I got to work I recorded under the vehicle and lo and behold the front driveshaft is spinning in 2wd.

My assumption is the FAD is not disengaging. I have no binding noises, I can shift into 4hi no problem, the only noticeable noise is the whine when coasting and the noise from the driveshaft spinning at highway speeds.

My question is: will this cause any damage to my transmission, front gears nd transfer case until it gets fixed? Should the shop replace the front gears or any other components when I request them to look at it? Any troubleshooting I can do at home that could potentially fix it without having to take anything a part?

 

[CalSgt]

Take it to the shop, could be an issue with the FAD or with the E-locker.

The FAD collar could be out of its groove on the shift fork or the Spicer E Locker can operate incorrectly if the sheet metal plate on the locker gets bent or isn't oriented correctly.

I would limit driving until the shop can take a look, depending on what is causing the issue you run the potential of making it worse.

It's not really a problem for the transfer case or gears to have the FAD hooked up and spinning the driveshaft, some people delete the FAD system altogether.

 

[CalSgt]

Also... Head on over to the give us a wave section and introduce yourself to the group

 

[Disciple Off Road]

Check your front axle, 24-25’s from what we have seen, no longer have a FAD. The housing for it on the axle is still there, but there is no actuator. If you aren’t sure, post up a pic of the axle on passenger side where the FAD would be.

 

[CalSgt]

Check your front axle, 24-25’s or at least that we have seen no longer have a FAD. The housing for it on the axle is still there, but no motor. If you aren’t sure, post up a pic of the axle on passenger/rear side.

That's good info to have... Do they just have a block off plate covering the hole?

 

[bobfriesenhahn]

Hey! New to the forum and what’s a better ice breaker than asking strangers for advice?

So I picked up my 24 JT Rubicon from a “reputable” Offroad shop on Friday after they regeared me to 4.88’s. On the drive home I had a noticeable whine from the front while coasting. Now today during freeway break-in I felt and heard a hum coming from the front and into the gas pedal. I came to the conclusion while driving that it felt as if the front driveshaft was spinning. So when I got to work I recorded under the vehicle and lo and behold the front driveshaft is spinning in 2wd.

My assumption is the FAD is not disengaging. I have no binding noises, I can shift into 4hi no problem, the only noticeable noise is the whine when coasting and the noise from the driveshaft spinning at highway speeds.

My question is: will this cause any damage to my transmission, front gears nd transfer case until it gets fixed? Should the shop replace the front gears or any other components when I request them to look at it? Any troubleshooting I can do at home that could potentially fix it without having to take anything a part?

Most 2024 Rubicons do not have FAD. Instead, the front axel always spins. Is your jeep also lifted? If it is lifted a lot you may need a new front driveshaft.