Rear End Creaking
- Thread starter f22beaver
- Start date
Have you tried pulling driveshafts to see if the noise follows front/rear? You listed that you just changed diff fluid... was that before or after the noise started? How did the spider gears look?
OP
The noise is absolutely from the rear, no questions asked there. I've had my head down there when it goes by, it's not forward of the TC.
Noise persisted both before and after diff fluid. Honestly it's been there since I bought it a year ago, so it has persisted across every single change I've made.
Re: spider gears, I think that's my next step. I didn't want to waste good gear oil, but short of just changing control arm bushings for fun I'm not sure what else I can accomplish here. Carrier inspection is probably the least intrusive thing I can do next. I've been doing a lot of reading today on the 44 TracLoc, I need to do a decent inspection of the spiders/clutch tabs/etc.
OP
I've been in there, and nothing came out in terms of loose pieces, but I didn't do an exhaustive search. I need to get back in there and look.
Whatever Jerry has said to use on this forum.
I can check later when home. I think it's an 80w-90. I'm now wondering if I'm first on any griffin modifier for the TracLoc.....
I've been in there, and nothing came out in terms of loose pieces, but I didn't do an exhaustive search. I need to get back in there and look.
Whatever Jerry has said to use on this forum.
I baited you a little on that question… sorry… Just wanted to see if you used friction modifier in that LSD. If it was chattering before, perhaps PO did not use it, and damaged the clutches…. What say you, mr TJ Guru @Jerry Bransford ?
OP
Well. I don't know. It's an STP 80w-90 but it doesn't actually mention an LSD. Says it meets GL5 requirements. Do all GL5 have friction modifiers?
OP
I hope I get this right.
I have a non-Rubicon Dana 44 so I believe I have the LSD that requires modifiers. I think a Truetrac is an aftermarket option.
The TruTrac is a gear driven LSD from Eaton. It does not require any modifier.
Whatever they called the factory clutch activated LSD does require a friction modifier. That assumes the clutch packs are still functioning.
I think the chatter noise you are getting it from the LSD… familiar sound, and especially since you said it happens more when turning…
@jjvw, do you have any knowledge on the Jeep LSD? Should he add some friction modifier? If the oil used has any modifier, it might not be enough… ?
I have only had Rubicon locker/gear driven LSDs which I have broken two of in two different ways. Neither of which are helpful here.
To the best of my knowledge, the factory clutch LSDs don't care if they don't have a friction modifier. They just won't work, assuming they would work if there was the modifier. But no damage is being done without it.
OP
@jjvw and @Artsifrtsi
Well, I'll need to add another data point tonight/tomorrow. But I just added somewhere between 4-5 oz of friction modifier and it is all but gone. In forward one time I heard it, but in reverse I did not. And I took the same loop around my town that had induced the sound in the past, so it was certainly hot enough.
So, it seems possible the initial indication is that STP gear oil does not have a friction modifier in it.
Well, I'll need to add another data point tonight/tomorrow. But I just added somewhere between 4-5 oz of friction modifier and it is all but gone. In forward one time I heard it, but in reverse I did not. And I took the same loop around my town that had induced the sound in the past, so it was certainly hot enough.
So, it seems possible the initial indication is that STP gear oil does not have a friction modifier in it.
well here's a likely dumb thought but here goes..
I just did a rear disc brake conversion. I notice you replaced the parking brake shoes. That sound has the same pitch as the parking brake spring/tensioning mechanism that I recall when messing with the adjustment. Any chance something not right with that?
OP
I ran it for months with no e-brake hardware so it wasn't that.
But I've now got 3 drives in it with the friction modifier and it's basically non-existent now. I'm going to wait a week just to be sure but I'm going to come back and modify the first post to say solved for anyone in the future to catch.
RBrogen
New Member
RBrogen
New Member
My son's 1998 Wrangler has this EXACT SOUND PROBLEM! We've been trying to track down the source and have begun replacing parts (also because they desperately needed replacing):
Driver Side Rear:
Upper and lower control arms
Stabilizer Links
Shocks
Passenger Side rear
Lower control arm (upper going in this weekend)
Stabilizer links
Shocks
Any insight into what this sound is would be HUGELY APPRECIATED!
Driver Side Rear:
Upper and lower control arms
Stabilizer Links
Shocks
Passenger Side rear
Lower control arm (upper going in this weekend)
Stabilizer links
Shocks
Any insight into what this sound is would be HUGELY APPRECIATED!
OP
Mine was friction modifier for sure. It was hard to measure but I put roughly 4-5 oz in. Good luck!
RBrogen
New Member
THANKS SOOOO MUCH!!! We are going to replace the rear gasket/oil and then add the friction modifier to know we are clean inside. I'll let you know what happens!