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Discussion Starter #1 (Edited)
Okay, so the the other day I noticed in my 08' GXP when driving at low speeds of less then 20mph I can hear a slight clunk/pop noise coming from the rear when I let off the gas padel. NOT the clutch. I'm also getting a rubbing or scrapping noise coming from the driver's side rear wheel.

Here lies my big problem, I'm not sure if it's only the diff that is making both of the noises or if the two are coming from two different areas. The scrapping sounds more like a bad wheel bearing. But would that cause the clunking noise too?

Last month my car was hit on that same side by some idiot changing lanes. The impact was on the rear fender above the wheel and he also hit the wheel it's self causing damage to the rim. I had it all fixed and have had the car back now for about 2 weeks. Now I am hearing these new noises and am trying to figure out if they missed a bad wheel bearing and only replaced the wheel. They did do a new alignment and ballanced the wheel. At first no problems, now I just started noticing this on Saturday. Should I start wit ta diff/fliud change and then go from there? I can always bring it back to the repair shop and tell them about the bearing, but I'm not sure if both noises are coming from the same area or not? Can anyone tell me when it is the proper time to replace the diff. fluid? Car has 29K miles on it.
 

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Okay, so the the other day I noticed in my 08' GXP when driving at low speeds of less then 20mph I can hear a slight clunk/pop noise coming from the rear when I let off the gas padel. NOT the clutch. I'm also getting a rubbing or scrapping noise coming from the driver's side rear wheel.

Here lies my big problem, I'm not sure if it's only the diff that is making both of the noises or if the two are coming from two different areas. The scrapping sounds more like a bad wheel bearing. But would that cause the clunking noise too?

Last month my car was hit on that same side by some idiot changing lanes. The impact was on the rear fender above the wheel and he also hit the wheel it's self causing damage to the rim. I had it all fixed and have had the car back now for about 2 weeks. Now I am hearing these new noises and am trying to figure out if they missed a bad wheel bearing and only replaced the wheel. They did do a new alignment and ballanced the wheel. At first no problems, now I just started noticing this on Saturday. Should I start wit ta diff/fliud change and then go from there? I can always bring it back to the repair shop and tell them about the bearing, but I'm not sure if both noises are coming from the same area or not? Can anyone tell me when it is the proper time to replace the diff. fluid? Car has 29K miles on it.
Hey there,

I am sorry to hear that you are experiencing an issue with your vehicle. Can I be of any assistance?

Safe travels,

Jennifer T.
GM Customer Care
 

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If you are hearing the clunk from the back, your diff is going out. Mine did the same thing.
 

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Discussion Starter #4 (Edited)
Yep, it was the diff. I dropped it off at my local dealership. Lucky for me it was covered under the factory power-train warranty. They even gave me a complimentary loaner car. Parts will not be in until Saturday. :( But at least I don't have to pay any thing.

Hey GM Customer Service, do I still need to pay for the initial service change of $109.00 for them to diagnose the problem? Seems like that should be waived too since it was what I thought it was and is covered under warranty. :)
 

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Yep, it was the diff. I dropped it off at my local dealership. Lucky for me it was covered under the factory power-train warranty. They even gave me a complimentary loaner car. Part will not be in until Saturday. :( But at least I don't have to pay any thing.

Hey GM Customer Service, do I still need to pay for the initial service change of $109.00 for them to diagnose the problem? Seems like that should be waived too since it was what I thought it was and is covered under warranty. :)
Send Jennifer a PM. They have to safeguard against a yes meaning "yes to all". People take it the wrong way etc., I'm sure you understand.


Sent from AutoGuide.com App
 

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Send Jennifer a PM. They have to safeguard against a yes meaning "yes to all". People take it the wrong way etc., I'm sure you understand.


Sent from AutoGuide.com App
Hey there RedDevil,

I am here! Can I assist you with something? I would love to hear from you.

Jennifer T.
GM Customer Care
 

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I would insist on a complete new diff. They rebuilt mine and it still whined. There was to much back lash in the gears. So they ended up putting a whole new diff. Do not accept if it is still whining when you let off the throttle. Plus it is not normal.
 

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I've had that "clunk" for a while, only when it downshifts from 2nd to 1st though. I thought that was "normal", that aggressive downshift I saw numerous threads on. Hmmmm. I don't hear it otherwise. I do hear a light "whine" when I'm cruising at 10-20mph and listen hard, but only ON the gas, not off it. Once I let off I can't hear anything.
 

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Discussion Starter #10
I've had that "clunk" for a while, only when it downshifts from 2nd to 1st though. I thought that was "normal", that aggressive downshift I saw numerous threads on. Hmmmm. I don't hear it otherwise. I do hear a light "whine" when I'm cruising at 10-20mph and listen hard, but only ON the gas, not off it. Once I let off I can't hear anything.
Why are you downshifting from 2nd into 1st? Most people when down shifting from a higher gear, especially into 1st will tell you to just put the car in neutral and come to a stop. Only then, when you are about to start moving again should you shift into 1st. Learn to use neutral when downshifting and avoid messing up your clutch and save your diff.
 

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Discussion Starter #11
I would insist on a complete new diff. They rebuilt mine and it still whined. There was to much back lash in the gears. So they ended up putting a whole new diff. Do not accept if it is still whining when you let off the throttle. Plus it is not normal.
They are not rebuilding it. They are replacing it. :yesnod:
 

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That's good news. I bet you heard the rubbing sound when you made your turns, like in a parking lot. That was the sound of the clutch packs in the diff sticking. You see a big difference in the sound when they install the new one.
 

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Why are you downshifting from 2nd into 1st? Most people when down shifting from a higher gear, especially into 1st will tell you to just put the car in neutral and come to a stop. Only then, when you are about to start moving again should you shift into 1st. Learn to use neutral when downshifting and avoid messing up your clutch and save your diff.
It's an automatic lol :cool:
 

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No that is not the case. I have an automatic and it is not normal.I had a 06 model with bad diff cluncked all the time. Once they replaced it , no more clunk. And my 09 is also an automatic and no clunk. So to say it is normal is incorrect. The dealer may sale it to you it is. But thats not the case.
 

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Discussion Starter #16 (Edited)
So my car is still waiting for the parts! First they tell me the parts will be in Saturday and that the car should be ready by end of day Monday. Then they call me on Sat. saying the parts arrival date has been changed to Tues. and the car will be ready on Wed. So I called yesterday and they tell me the parts never showed up and they cannot find the complete differential and parts in Texas and it will have to be ordered from outside Texas. I don't care where it comes from I just want my car back. I also noticed that my car's warranty 5yr/100k mile warranty expires on Aug. 13th! So now I am thinking they are delaying on purpose so they can tell me when the parts arrive that they can only do the work if I pay for it because the warranty will have expired after that date. It's not my fault they cannot find the part! I brought the car in last Tuesday, so the day I brought the car in should and the date from which the orginally told me the car would be ready, should be honored. They better not be trying to pull some B.S. on me. Looks very crooked to me. Car only has 29K miles on it and is a late 08' build.
 

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Hi there!

The work started before the warranty expires, so it should be covered.

Nothing fishy here. The parts are just not easy to come by. See other threads on getting windshields or catalytic converters. Sometimes there's just a longer lead time for our cars since they're not in production any more and they didn't make that many to begin with.
 

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Discussion Starter #18
Hi there!

The work started before the warranty expires, so it should be covered.

Nothing fishy here. The parts are just not easy to come by. See other threads on getting windshields or catalytic converters. Sometimes there's just a longer lead time for our cars since they're not in production any more and they didn't make that many to begin with.
Yeah, I figured the parts were getting harder to come by. And what you said is true, the work date they did the diagnostic was last week so it should be covered from that day. :thumbs:
 

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Why are you downshifting from 2nd into 1st? Most people when down shifting from a higher gear, especially into 1st will tell you to just put the car in neutral and come to a stop. Only then, when you are about to start moving again should you shift into 1st. Learn to use neutral when downshifting and avoid messing up your clutch and save your diff.
Why use neutral? Really not safe, it may save you some gas in older vehicles but not todays vehicles.
Geesh I drive and have driven a standard for many years...I have never shifted into neutral coming to a stop, after I stopped yes, only to give my leg a rest. If your clutch and diff are that weak sell the car...Using the engine to help you brake, saves you from replacing brake shoes as often and still leaves you in control of the car if you need to take off or maneuver in a hurry . In my case with a V8 and side pipes it sounds bad ass...
 
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