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Old 09-22-2010, 11:36 AM   #1
jklipan
 
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LS3 Differential Issues

All:

Just wanted to see if anyone has experienced any problems with their differential in the LS3.

A few weeks after I brought the car home (Nov 2009), I experienced a very loud and hard bang in the differential while attempting to back out of the garage. I let this go thinking that this was just the gearing/traction control settling in. Unfortunately this is not the case. After almost a full year, the condition persists. This not simply some slight "clank" in the gearbox. This can be felt through the subframe system right into the back of your seat.

About 3 weeks ago, this progressed to the differential going into a complete bind-up. To explain, I back the car out of the garage using only idle power. On this occaision, the car would not move at all. This made me get out, while the engine was still running, and check to see that there was nothing blocking the back tires. I literally got the sensation that the back tires were chocked. I got back in the car and moved it forward in 1st just to see what would happen. The resounding bang that I had experienced before happend again. (It is as if the pinon gear is out of alignment or something). I wonder if this has something to do with the traction control system. It usually happens after the car has been static for awhile (I only drive it on the weekends).

I decided to take it to the dealer (Fitzgerald's in Frederick, MD). I explained what the problem was and that I would not bring the car in for some minor symptom. This is for sure, no fooling, something not right. After leaving the car over the weekend they told me to come and get it and that nothing further was to be done with it as they could not reproduce the condition. I asked if they had even drained the differential fluid to check to see if there were any metal shavings or debris that would indicate a problem. The reply was that there were no factory notifications that would warrant further investigation.

So I asked for clarification as to the dealer's approach to the issue. I expressed that what I was getting was that we (the dealer) will let the condition sit until it worsens, or the "rear-end craters", and then if something does happen, I am covered because I brought the car in noting the complaint. This makes absolutely no sense to me.

Has anyone had this experience with the manual transmission?

Thanks,

Jeff
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Old 09-22-2010, 11:50 AM   #2
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Do you use your e-brake when parked? I ask because when I first got the car I had that same type of noise occur when backing up. Once I stopped using the e-brake for parking the car I've never experienced it again.
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Old 09-22-2010, 11:53 AM   #3
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So your saying that this is the braking system that is causing this?? Man that is wierd? What about the system is making this popping sound. That would explain the inability to back the car up at idle speed. This means that the braking system isn't releasing when you disengage it.
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Old 09-22-2010, 12:08 PM   #4
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Are your rotors wet before you park it? If they are, the brake pads will rust to the rotors and make quite a pop when they free up.

A differential problem generally appears when already rolling and making a turn.

When I picked up my car brand new, the dealer washed it in a bay and let it sit there over night. When I went to back it out after we did all the new car get to know you stuff, it was locked up solid. Thought I was going to smoke the clutch trying to get it to move. But it popped free with quite a bang, and I was off. Since seeing that happen, I always drive it after washing to clean/dry the rotors off.
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Old 09-22-2010, 12:15 PM   #5
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Russell:

Didn't think about this but I always wash it before I put it away for the week. If this is the case then this does make sense. I do drive it after I wash it to spin the water off the wheels, but I guess that some moisture remains on the rotors even though. Everytime this happens, it scares the $#!% out of me. It sounds like the rearend is coming unglued!
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Old 09-22-2010, 12:30 PM   #6
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Sounds like that is all it is. It has been very common with the SS as the Brembo brakes must be pretty high metallic content. Having the car stuck like that and then the bang is pretty alarming, but it's just the pads popping loose from being stuck.

You could try taking a second short drive after the car has completely dried. Wash, dry, short drive, park it for a couple hours or the next day, then another short drive. That should leave the rotors clean and dry.
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Old 09-22-2010, 12:33 PM   #7
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Thanks Russell:

As always, you are a fountain of information. You are a great information resource to this site.

Thanks man!!

Jeff
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Old 09-22-2010, 12:37 PM   #8
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had this happen on a cold feezing night
Quote:
Originally Posted by Russell James View Post
Are your rotors wet before you park it? If they are, the brake pads will rust to the rotors and make quite a pop when they free up.

A differential problem generally appears when already rolling and making a turn.

When I picked up my car brand new, the dealer washed it in a bay and let it sit there over night. When I went to back it out after we did all the new car get to know you stuff, it was locked up solid. Thought I was going to smoke the clutch trying to get it to move. But it popped free with quite a bang, and I was off. Since seeing that happen, I always drive it after washing to clean/dry the rotors off.
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Old 09-22-2010, 12:50 PM   #9
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I'm from West Texas so I know how cold the desert can be. Dry though.
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Old 09-22-2010, 12:55 PM   #10
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Quote:
Originally Posted by jklipan View Post
I'm from West Texas so I know how cold the desert can be. Dry though.
next time try parking it without the brake, either just leave it in gear or chock the wheels.
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Old 09-22-2010, 01:08 PM   #11
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Yep, I will be driving the car on Friday and it will have been sitting for a week after washing it. I did use the brake out of habit so it will be interesting to see if the pads have bound up with the rotors. I will let everyone know what I find out. Will start parking w/o the brake.
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Old 09-22-2010, 01:13 PM   #12
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I would pursue your problem further. I destroyed the clutches in the rear of my m6. I am in the process of having a nine inch installed which is supposedly "bullet-proof". If you get no satisfaction at the dealer level, go to the next level and call GM. Do not give up.
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Old 09-22-2010, 01:24 PM   #13
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You have another problem my friend!!! I don't know what it is but it is NOT wet brake pads!!! I drive mine just like you and almost always park it after a wash and have never had that problem.
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Old 09-22-2010, 01:49 PM   #14
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Quote:
Originally Posted by flyby View Post
I would pursue your problem further. I destroyed the clutches in the rear of my m6. I am in the process of having a nine inch installed which is supposedly "bullet-proof". If you get no satisfaction at the dealer level, go to the next level and call GM. Do not give up.
Flyby:

Can you elaborate. How exactly did you destroy the clutches?
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Old 09-22-2010, 02:54 PM   #15
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Too much horsepower. Hard launches at the track. Major wheel hop before installing Pedders drag package. I'm sure I missed something but you get the idea.
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Old 09-23-2010, 01:17 PM   #16
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i was getting a roaring noise in mine when backing or turning a certain way when cold, took to the dealer said my posi clutches were stiking they drained the fluid a replaced with new limited slip additive, it was all good for about 3,000 now it's doing it again, I took it back they claimed they couldn't hear it a second time so will have to wait for the roar to get louder again before taking it back, I hear it and it is very annoying! There is something wrong and they jsut tried to band -aid it, they showed me a bulletin for the fix they did.
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Old 09-25-2010, 10:49 AM   #17
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Here's how it turned out on Friday. Released the E brake and backed the car out without any issues. For now I think that I have to agree with Russell. The pads must have been sticking to the rotors. Put the rear end under some stress on the way into Maryland from Virginia (broke the tires loose a couple of times) and there were no problems. Will drive it again today to listen for any strange noises.
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Old 10-16-2010, 07:12 AM   #18
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I had a loud CLICK (Metal on Metal) noise coming from the rear end when ever I took off, or went in reverse... Took it in and they had to get to both rear axles to put in two washers and a bolt, or something. Ever since the noise has been gone.
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Old 10-16-2010, 08:31 AM   #19
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Yeah not moving is the brakes locking. I had not driven my car over last christmas as we where on Stephanies Make A Wish trip and when I came home to back the Bee out loud bang from front and rear of car. I stopped right away and you could see the rust marks where the pads has locked to the rotor.

Being a weekend warrior car or not driven often this will happen to your car.
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