Bad bearings

[MLC40]

I have a 2018 JL Sport with 18,000 miles. When trying to brake, it felt like it didn’t want to stop. Took it in, and they couldn’t replicate the problem so I asked for someone to ride with me because I didn’t feel safe driving it daily. Fortunately, or unfortunately depending on how you look at it, it happened with the service tech in the vehicle. Now they are saying it’s the shift differential and a bearing is bad. Has anyone else had this problem? I’m frustrated because this just adds to the list of issues I had since purchasing my Jeep brand new.

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[D60]

What the heck is a "rear shift differential" and how does it affect braking?? And what bearing?

edit: they may want to test your kanooter valve and muffler bearings, too

 

[MLC40]

What the heck is a "rear shift differential" and how does it affect braking?? And what bearing?

edit: they may want to test your kanooter valve and muffler bearings, too

What the heck is a "rear shift differential" and how does it affect braking?? And what bearing?

edit: they may want to test your kanooter valve and muffler bearings, too[/QUOTE

Gears inside the differential accomplish this purpose, providing a 90-degree direction change along the rear axles. The power is transmitted from the rear differential along axle shafts that connect to the wheels and rotate to propel the vehicle forward.

The bearings in the shift differential.

 

[flightace47]

MLC40:

Sarcasm aside (and D60 has used it quite appropriately here), the dealer appears to be increasing the scope of your repair work to either take you or FCA for a ride at high cost of money, your time, and frustration.

There is no “rear shift differential”. There is a “rear differential”, and a transmission (this list is not exhaustive of all drive line components). The rear differential splits power to your two rear wheels as your quote says, but it is not responsible for shifting gears (the purpose of the transmission).

What’s funny is NONE of those have to do with application of your brakes. If the engine is supplying power when it shouldn’t, then sure, you might have a problem slowing down, but that is very unlikely and would show up as other drivability problems. If there is a problem with bearings in any of your drive line components, you’d want it looked at, but malfunctioning brakes is not an indicator of such problems.

You should consider getting a second opinion with another dealer or a competent independent mechanic. These guys are setting you up for the meat grinder.

The terms you want to hear mechanics talking about surrounding your issue are things like brake pads, brake rotors, master cylinder, ABS valves/sensors/controller/pump, and brake or vacuum booster.

Lack of power assist for brakes is a very serious safety problem and you should not drive the vehicle if you are not confident that you can make it stop when you want.

 

[MLC40]

MLC40:

Sarcasm aside (and D60 has used it quite appropriately here), the dealer appears to be increasing the scope of your repair work to either take you or FCA for a ride at high cost of money, your time, and frustration.

There is no “rear shift differential”. There is a “rear differential”, and a transmission (this list is not exhaustive of all drive line components). The rear differential splits power to your two rear wheels as your quote says, but it is not responsible for shifting gears.

What’s funny is NONE of those have to do with application of your brakes. If the engine is supplying power when it shouldn’t, then sure, you might have a problem slowing down, but that is very unlikely and would show up as other drivability problems. If there is a problem with bearings in any of your drive line components, you’d want it looked at, but malfunctioning brakes is not an indicator of such problems.

You should consider getting a second opinion with another dealer or a competent independent mechanic. These guys are setting you up for the meat grinder.

The terms you want to hear mechanics talking about surrounding your issue are things like brake pads, brake rotors, master cylinder, ABS valves/sensors/controller/pump, and brake or vacuum booster.

Lack of power assist for brakes is a very serious safety problem and you should not drive the vehicle if you are not confident that you can make it stop when you want.

Thank you @flightace47. I honestly posted exactly what I was told. I will most definitely take it to another dealership. They brought out a small container of liquid that was black and said it should be clear. This is my first Jeep, and unfortunately I’ve had horrible luck.

 

[D60]

Thank you @flightace47. I honestly posted exactly what I was told. I will most definitely take it to another dealership. They brought out a small container of liquid that was black and said it should be clear. This is my first Jeep, and unfortunately I’ve had horrible luck.

This sounds like when the LSD (limited grip, er slip diff) eats itself, or more specifically it's clutch packs. Do you know if you have the factory LSD?

But this has nothing to do with brakes.

Unrelated, but I suppose things like the Eaton 2 speed rear ends provided a "shift differential," but trust me - no Wrangler is so equipped

 

[MLC40]

This sounds like when the LSD (limited grip, er slip diff) eats itself, or more specifically it's clutch packs. Do you know if you have the factory LSD?

But this has nothing to do with brakes.



Unrelated, but I suppose things like the Eaton 2 speed rear ends provided a "shift differential," but trust me - no Wrangler is so equipped

@D60

 

[D60]

Yep you've got the D44 with "anti-spin."

You should set aside at least 1/2 hour (preferably more) and just start reading this:
https://www.jlwranglerforums.com/forum/threads/knock-in-rear-with-dana-44.16921/

and still none of this has to do with braking. I mention it ONLY because your dealer has apparently spoken of your rear diff AND shown you black fluid

 

[flightace47]

Yep. We’re not saying you don’t have a problem with your diff. What’s messed up is your dealer is not addressing your braking concern at all so far.

 

[MLC40]

Yep you've got the D44 with "anti-spin."

You should set aside at least 1/2 hour (preferably more) and just start reading this:
https://www.jlwranglerforums.com/forum/threads/knock-in-rear-with-dana-44.16921/

and still none of this has to do with braking. I mention it ONLY because your dealer has apparently spoken of your rear diff AND shown you black fluid

Thank you!

 

[JeepCares]

I have a 2018 JL Sport with 18,000 miles. When trying to brake, it felt like it didn’t want to stop. Took it in, and they couldn’t replicate the problem so I asked for someone to ride with me because I didn’t feel safe driving it daily. Fortunately, or unfortunately depending on how you look at it, it happened with the service tech in the vehicle. Now they are saying it’s the shift differential and a bearing is bad. Has anyone else had this problem? I’m frustrated because this just adds to the list of issues I had since purchasing my Jeep brand new.

Hi MLC40,

We would like to hear more about this and offer our assistance should you choose to visit another dealer. Please send us a private message during that time!

Julie
JeepCares

 

[MLC40]

Hi MLC40,

We would like to hear more about this and offer our assistance should you choose to visit another dealer. Please send us a private message during that time!



Julie
JeepCares

How can I contact you? @JeepCares

 

[MLC40]

Yep you've got the D44 with "anti-spin."

You should set aside at least 1/2 hour (preferably more) and just start reading this:
https://www.jlwranglerforums.com/forum/threads/knock-in-rear-with-dana-44.16921/

and still none of this has to do with braking. I mention it ONLY because your dealer has apparently spoken of your rear diff AND shown you black fluid

Thanks @D60. They just told me they’re basically replacing the whole rear end.

 

[JeepCares]

How can I contact you? @JeepCares

You can connect with us by clicking on our profile picture and selecting "Send a Private Message."

Julie
JeepCares

 

[RagTopDeluxe]

I have a 2018 JL Sport with 18,000 miles. When trying to brake, it felt like it didn’t want to stop. Took it in, and they couldn’t replicate the problem so I asked for someone to ride with me because I didn’t feel safe driving it daily. Fortunately, or unfortunately depending on how you look at it, it happened with the service tech in the vehicle. Now they are saying it’s the shift differential and a bearing is bad. Has anyone else had this problem? I’m frustrated because this just adds to the list of issues I had since purchasing my Jeep brand new.

I had bad bearings in my rear differential at <500 miles. The problem manifest by a loud noise out the back—similar to grinding. As stated above, that had no impact on braking. The dealer fixed it and I haven't had any issues with the differential since then.

I started a thread that includes a video, if you're curious:
https://www.jlwranglerforums.com/fo...ings-are-defective-less-than-500-miles.29084/

Good luck.

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