Knock in rear with Dana 44

1quick1

Moderator
Staff member
Moderator
Joined
Oct 16, 2017
Messages
1,469
Reaction score
1,716
Location
Colorado
Vehicle(s)
2018 JLUS
Vehicle Showcase
1
Pretty rough thread. I did my rear diff fluid at 25k miles and it was pitch black. Didn't see metal shavings though but the magnetic drain plug was gunked up. Knock on wood mine hasn't had noises so maybe I'm lucky. Going on a 2,500 mile road trip starting tomorrow to visit the fam in Toledo.





Advertisement

 

Octocycler

Active Member
First Name
Scot
Joined
May 27, 2020
Messages
27
Reaction score
7
Location
Madison WI
Vehicle(s)
2018 Wrangler JLU Sahara

I’d like to know the answer to that too.
I had done some googling and found nothing with that number ending in AB or AC, which possibly means they had a couple design iterations that never made it to production. I also did a little skimming back through this 74 page thread and found posts from spring 2019 of people getting replacements that were the AA part - which means they were still replacing these with more of the faulty design (maybe new one wasn't release or they were using up inventory) - which could easily explain people having multiple replacements. So I am hopeful that this is a real fix. My axle still hasn't come in though it was promised last week.
 
Last edited:

Pressuregarage

Well-Known Member
First Name
Kaimana
Joined
Nov 14, 2018
Messages
107
Reaction score
221
Location
Kauai,Hawaii
Vehicle(s)
2019 JL Sahara
Occupation
Operating Engineer Local 3
With so many people with similar problems I’m surprised this thread isn’t stickied
 

trav87

Well-Known Member
First Name
Travis
Joined
Apr 7, 2018
Messages
139
Reaction score
182
Location
PNW
Vehicle(s)
2018 JLU
Build Thread
Link
Vehicle Showcase
1


I had done some googling and found nothing with that number ending in AB or AC, which possibly means they had a couple design interations that never made it to production. I also did a little skimming back through this 74 page thread and found posts from spring 2019 of people getting replacements that were the AA part - which means they were still replacing these with more of the faulty design (maybe new one wasn't release or they were using up inventory) - which could easily explain people having multiple replacements. So I am hopeful that this is a real fix. My axle still hasn't come in though it was promised last week.
I've had 2 AA replacements so far. I have a voicemail in with my dealer asking for an update since it's been a week today since I dropped mine off
 

Valkyrie

Well-Known Member
First Name
Tony
Joined
Jun 3, 2020
Messages
59
Reaction score
22
Location
Powderly, Texas 75473
Vehicle(s)
2019 Jeep Wrangler JL Sport 2 Door


I had done some googling and found nothing with that number ending in AB or AC, which possibly means they had a couple design iterations that never made it to production. I also did a little skimming back through this 74 page thread and found posts from spring 2019 of people getting replacements that were the AA part - which means they were still replacing these with more of the faulty design (maybe new one wasn't release or they were using up inventory) - which could easily explain people having multiple replacements. So I am hopeful that this is a real fix. My axle still hasn't come in though it was promised last week.
I'm hopeful that it is a real fix as well. I'd surely like to know what has been changed about it. Especially, before I spend the big bucks to have my axles replaced. If I knew that this would fix the issue, then I would be happy with the LSD. I'm not sure who any of us could talk to to find out what was changed about the rear axle to warrant a new part #.
 

Octocycler

Active Member
First Name
Scot
Joined
May 27, 2020
Messages
27
Reaction score
7
Location
Madison WI
Vehicle(s)
2018 Wrangler JLU Sahara
I'm hopeful that it is a real fix as well. I'd surely like to know what has been changed about it. Especially, before I spend the big bucks to have my axles replaced. If I knew that this would fix the issue, then I would be happy with the LSD. I'm not sure who any of us could talk to to find out what was changed about the rear axle to warrant a new part #.
My advisor said that stuff is kept tightly secret. My guess is that, barring doing a costly recall, they wouldn't want the information out because informed people will choose not to buy a new JL without confirmation that it's got the improved axle/LSD on there. So the world may never know....
 

trav87

Well-Known Member
First Name
Travis
Joined
Apr 7, 2018
Messages
139
Reaction score
182
Location
PNW
Vehicle(s)
2018 JLU
Build Thread
Link
Vehicle Showcase
1
Got the call from the service manager today. FCA is replacing my entire rear axle with the AD part number, The FCA engineers are claiming my 285/70/17 tires are part of the problem, so I have to bring my stock wheels and tires in so the dealer can mount them, and any future service will require me showing up with stock sized wheels and tires. Funny that a D44 comes stock with 285/70/17 in the Rubicon...
Oh well, only 2500 miles left on my drivetrain warranty. Guess it's time to upgrade to aftermarket axles if/when it happens again.
On a plus, I've never had to change the rear diff fluid yet lol
 

D60

Well-Known Member
Joined
Apr 1, 2019
Messages
1,518
Reaction score
1,644
Location
CO
Vehicle(s)
JL
Got the call from the service manager today. FCA is replacing my entire rear axle with the AD part number, The FCA engineers are claiming my 285/70/17 tires are part of the problem, so I have to bring my stock wheels and tires in so the dealer can mount them, and any future service will require me showing up with stock sized wheels and tires. Funny that a D44 comes stock with 285/70/17 in the Rubicon...
Oh well, only 2500 miles left on my drivetrain warranty. Guess it's time to upgrade to aftermarket axles if/when it happens again.
On a plus, I've never had to change the rear diff fluid yet lol
That's just a cop out. I'd like an engineer to explain how larger tires cause LSD clutches to wear faster. It just doesn't pass muster.

Plus with any other LSD it shouldn't start eating spider or side gears when the clutch material is gone, it should just stop working as a TAD
 

trav87

Well-Known Member
First Name
Travis
Joined
Apr 7, 2018
Messages
139
Reaction score
182
Location
PNW
Vehicle(s)
2018 JLU
Build Thread
Link
Vehicle Showcase
1
I agree, it's a total cop out. Hopefully the new part number actually fixes the issue and I never have to think about this again.
 

Octocycler

Active Member
First Name
Scot
Joined
May 27, 2020
Messages
27
Reaction score
7
Location
Madison WI
Vehicle(s)
2018 Wrangler JLU Sahara
The FCA engineers are claiming my 285/70/17 tires are part of the problem,
So much for the reputation of Wranglers and their engineering to encourage offroading an modification.
Mine are 285/65R18 and I didn't hear any such feedback - regardless I had them on only a few days when I heard the sound - and the fluid was pitch black when I went in within two days of that. That fluid burned up over 20k miles with the stock wheels and tires.
 

Octocycler

Active Member
First Name
Scot
Joined
May 27, 2020
Messages
27
Reaction score
7
Location
Madison WI
Vehicle(s)
2018 Wrangler JLU Sahara
"The FCA engineers are claiming my 285/70/17 tires are part of the problem"

@JeepCares - coming from a marketing manager, I'd say you guys have a product positioning problem with Jeep Wranglers if that's really the message from FCA
 

brewtus98

Well-Known Member
First Name
Bryan
Joined
Oct 5, 2018
Messages
219
Reaction score
305
Location
Toledo, Ohio
Vehicle(s)
2018 Sahara, 2003 TJ, 2004 TJ Rubicon
Vehicle Showcase
1
Correct me if wrong but doesn’t MOAB have the LSD along with Rubicon sized wheels/tires?
 

Taggerz

Member
First Name
JB
Joined
Apr 21, 2019
Messages
10
Reaction score
5
Location
WI
Vehicle(s)
'18 JLU Sport
The latest "cause" my dealer's service department pointed to was worn bushings/sleeves in my rear shocks. I called Fox a couple days ago and got part numbers. Replaced lower eyelet bushings/sleeves on my rear shocks today. Went for a ride and the knock remains...

Called up the dealer and had a conversation with the service advisor. He's agreed to pop the cover for an inspection. Appointment is next Wednesday, will report back after that.
 

jmcdtucson

Well-Known Member
First Name
Jerel
Joined
Jun 17, 2018
Messages
698
Reaction score
639
Location
Tucson, AZ
Vehicle(s)
2018 JLU Sport S
Vehicle Showcase
1
Correct me if wrong but doesn’t MOAB have the LSD along with Rubicon sized wheels/tires?
Yes, same size tires as Rubicon. Also Rubicon suspension I believe.
 

Pressuregarage

Well-Known Member
First Name
Kaimana
Joined
Nov 14, 2018
Messages
107
Reaction score
221
Location
Kauai,Hawaii
Vehicle(s)
2019 JL Sahara
Occupation
Operating Engineer Local 3
UPDATE:
Our dealer is Changing the Differential.
NOT the complete axle assembly.
Part number for this “Fix” is : 68401154AB
Just went in and had them research if this diff is a “Revised” part and NOT the same failing diff.
They couldn’t give me an answer.
Contacted @JeepCares via DM to update our case.
Just keeping all of you informed.
 

Advertisement




Smart Stop Start
 



Advertisement
Top