How to check if LSD is working properly?

basinite

Well-Known Member
First Name
Chris
Joined
Nov 9, 2019
Messages
72
Reaction score
91
Location
Utah
Vehicle(s)
2020 Willys
The only way both tires COULD turn forward together is with the transmission in neutral.

In park, the driveshaft will be locked solid. If you jacked it up snd turned the passenger side wheel forward the spider gears in the differential would spin the drivers side wheel the opposite DIFFERENTIAL direction.

As I said before, some LS diffs have spring pressure holding the clutch plates together. These are “tight” versions that are always on but allow slip for turning.

The dana LS is a “loose” LS that allows the spider gears and clutches to slip until a certain amount of slippage “activates” the friction surface on the clutches and locks the diff which gives you equal wheel speed left to right.
Bikemobile,

Do these "loose" LSD's last longer than traditional LSD's? Perhaps due to less wear and tear on the clutch plates?



Advertisement



 

Taggerz

Member
First Name
JB
Joined
Apr 21, 2019
Messages
8
Reaction score
4
Location
WI
Vehicle(s)
'18 JLU Sport
You need to lift both tires and make sure your tranny is in neutral. Let us know what yours does.
Found this thread via the knock in the rear diff thread....the only way I have been able to get the tires to spin the same direction is with the jeep on stands running and in neutral. The wheels spin forwards on their own.
 

basinite

Well-Known Member
First Name
Chris
Joined
Nov 9, 2019
Messages
72
Reaction score
91
Location
Utah
Vehicle(s)
2020 Willys
Found this thread via the knock in the rear diff thread....the only way I have been able to get the tires to spin the same direction is with the jeep on stands running and in neutral. The wheels spin forwards on their own.

I had the same results a few months back, different circumstances. I was hi-centered in the snow while out messing around in the middle of no where. Both rear tires would spin at the same time, while my front tires would alternate between left and right after a few seconds, due to the Break Lock Differential.

It was actually kind of cool to watch, wish I could go back in time and I would have filmed it. I was more concerned with getting un-stuck at the time. Hindsight is 2020. LOL.
 

ThirtyOne

Well-Known Member
Rock Sponsor (Level 1)
Joined
Apr 18, 2017
Messages
4,290
Reaction score
5,931
Location
Chapel Hill, NC
Website
www.jeepdoodles.com
Vehicle(s)
2018 Jeep Wrangler Sport S, 2017 Chevy Tahoe, 2005 Jeep Liberty
How many miles on it? Trac-lok has never been known for longevity, it’s possible the clutch packs can wear out in as little as 30k.

If your still under warranty it’s covered to rebuild it.
Have you heard of examples of the JL LSD clutch packs wearing out after 30,000 miles? I only ask because this claim has been circulating for years based on prior models and has become repeated as fact even though I could only ever find one documented case online where it actually occurred. I am wondering if there is more data specific to the JL.
 

SecondTJ

Well-Known Member
Joined
Jan 9, 2019
Messages
826
Reaction score
656
Location
Il
Vehicle(s)
Jeep
Have you heard of examples of the JL LSD clutch packs wearing out after 30,000 miles? I only ask because this claim has been circulating for years based on prior models and has become repeated as fact even though I could only ever find one documented case online where it actually occurred. I am wondering if there is more data specific to the JL.
Quick search shows 1 thread on here shot at 14k, but he opened up his pumpkin for lockers.

I think it’s 2 things.

1) JL is still too new, time will catch up to it
2) ESC/BLD is more effective for traction and people are giving LSD more credit than its due. The ESC/BLD is essentially covering up the worn out LSD without people knowing it.
 

TEXGOAT

Well-Known Member
Joined
Apr 2, 2020
Messages
1,023
Reaction score
637
Location
Texas
Vehicle(s)
2018 JLU
My how times change. 50 years ago you could easily find someone who could tell you if LSD worked or not. Timothy Leary comes to mind. Now you ask a question like this and Jeeps pop into the conversation.
If you push the button out in the Moab and the full moon appears in the sky and the electric blue coyotes start howling like Hendrix's guitar at Monterey, it's working!
 

basinite

Well-Known Member
First Name
Chris
Joined
Nov 9, 2019
Messages
72
Reaction score
91
Location
Utah
Vehicle(s)
2020 Willys
Have you heard of examples of the JL LSD clutch packs wearing out after 30,000 miles? I only ask because this claim has been circulating for years based on prior models and has become repeated as fact even though I could only ever find one documented case online where it actually occurred. I am wondering if there is more data specific to the JL.

As much as I hate to admit it I wouldn't be surprised if some are. The reason: I changed out my rear diff oil at around only 4,000 miles and it looked like black tar. I posted a pic on one of these threads.

I think if people DONT change out the fluid early on, they will have issues. I can't imagine those clutch packs lasting very long under those conditions. I'm going to change mine again at 10,000 miles and see how it looks. Hopefully it was only a result of the break in process.
 

ThirtyOne

Well-Known Member
Rock Sponsor (Level 1)
Joined
Apr 18, 2017
Messages
4,290
Reaction score
5,931
Location
Chapel Hill, NC
Website
www.jeepdoodles.com
Vehicle(s)
2018 Jeep Wrangler Sport S, 2017 Chevy Tahoe, 2005 Jeep Liberty
As much as I hate to admit it I wouldn't be surprised if some are. The reason: I changed out my rear diff oil at around only 4,000 miles and it looked like black tar. I posted a pic on one of these threads.

I think if people DONT change out the fluid early on, they will have issues. I can't imagine those clutch packs lasting very long under those conditions. I'm going to change mine again at 10,000 miles and see how it looks. Hopefully it was only a result of the break in process.
That's not the same thing as clutch packs wearing out at
Quick search shows 1 thread on here shot at 14k, but he opened up his pumpkin for lockers.

I think it’s 2 things.

1) JL is still too new, time will catch up to it
2) ESC/BLD is more effective for traction and people are giving LSD more credit than its due. The ESC/BLD is essentially covering up the worn out LSD without people knowing it.
I think those are reports from owners with the knocking, which I don't believe is caused by normal wear. I am going to have my mechanic take a look at it. I have 36,000 miles so enough time for something to develop if this is normal.
 

BCalvin

Well-Known Member
Joined
Jun 7, 2020
Messages
80
Reaction score
131
Location
Phoenix
Vehicle(s)
2020 Willys JLU, 1996 Porsche 993, 2007 Hummer H3
If you push the button out in the Moab and the full moon appears in the sky and the electric blue coyotes start howling like Hendrix's guitar at Monterey, it's working!
I was going to say it usually takes about 45 minutes to kick in, keep spinning the wheel.
 

SecondTJ

Well-Known Member
Joined
Jan 9, 2019
Messages
826
Reaction score
656
Location
Il
Vehicle(s)
Jeep

                           













































Top