2005 XLR Rear Differential - Cadillac XLR Forum: XLR and XLR-V Forums
 
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post #1 of 9 (permalink) Old 07-21-2011, 09:41 AM Thread Starter
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2005 XLR Rear Differential

I want to say first thing that my husband and I love this web site, we have been reading posts since we first bought our 2005 XLR, September 2010, I love the information that you can find.
Last week my XLR started making a buzzing noise, think playing cards clipped to your bike tire spokes, the noise seemed to be coming from the rear of the car. Yesterday, I took it to the GMC dealer, that I purchased the car from, for an oil change and to have the seat power box on the driver's seat replaced, the clips had broken off. They had the mechanic take a look at it, to see what the buzzing noise was. He said it is the rear differential and that we will need to take it to a Cadillac dealership to have it repaired or replaced. My question is this still under the drive train warranty or any warranty? I have a tad over 31,000 miles on the car. I checked the website and I have not found anyone else mentioning this issue... HELP! BTW, I love the suggestion to request a Cadillac Service History report, why didn't we think of that!!!!
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post #2 of 9 (permalink) Old 07-21-2011, 10:58 AM
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Well I don't think the differential is making the noise you describe but it's difficult to be sure without standing next to it.

You may be a victim of the positraction plates sticking. This is a simple fix whichis accomplished by removing the rear end fluid and replacing it and adding a positraction additive.

Time: Maybe 1 hour at the most.

Cost: $50--$60 The amount of your GMPP deductible. What a coincidence......Ha, Ha

I hope this is the solution.

Regards

Jerry



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post #3 of 9 (permalink) Old 07-21-2011, 11:02 AM Thread Starter
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LOL, that is a coincidence! I have been reading some old posts on the technical discussion page, regarding rear ends and that maybe the issue, I would describe it as a buzzing, but it could be grinding to someone else. Based on what I read, I called my GM dealer to see what they could find out about the switch to Moble 1Syn Fluid. Fingers are crossed!!!!!!
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post #4 of 9 (permalink) Old 07-22-2011, 11:29 PM
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I have been told Mobil 1 Diff fluid is NOT to be used in our cars
see the following:
Dexron LS is the latest rear axle fluid & it already has the limited-slip friction modifier blended in it.
TSB #07-04-20-002B
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post #5 of 9 (permalink) Old 07-23-2011, 07:14 AM
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Quote:
Originally Posted by FSU ROX View Post
I want to say first thing that my husband and I love this web site, we have been reading posts since we first bought our 2005 XLR, September 2010, I love the information that you can find.
Last week my XLR started making a buzzing noise, think playing cards clipped to your bike tire spokes, the noise seemed to be coming from the rear of the car. Yesterday, I took it to the GMC dealer, that I purchased the car from, for an oil change and to have the seat power box on the driver's seat replaced, the clips had broken off. They had the mechanic take a look at it, to see what the buzzing noise was. He said it is the rear differential and that we will need to take it to a Cadillac dealership to have it repaired or replaced. My question is this still under the drive train warranty or any warranty? I have a tad over 31,000 miles on the car. I checked the website and I have not found anyone else mentioning this issue... HELP! BTW, I love the suggestion to request a Cadillac Service History report, why didn't we think of that!!!!
Two thoughts:

1/ Could it be the fuel pump? The fuel pump works at different rates depending on load. I have found that I can hear a distinct humm or buzz at certain levels in the tanks, more prominent a second or so after coming to a complete stop (though still in drive)

2/ My service department recommend that from time to time I run a series of figure of eights at a very low speed turning as tightly as possible. This needs an empty parking lot and serves to lubricate the LSD some, while it is allowing maximum differential rotation.
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post #6 of 9 (permalink) Old 07-24-2011, 03:56 PM Thread Starter
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Quote:
Originally Posted by DonGib View Post
I have been told Mobil 1 Diff fluid is NOT to be used in our cars
see the following:
Dexron LS is the latest rear axle fluid & it already has the limited-slip friction modifier blended in it.
TSB #07-04-20-002B
__________________
Don, My dealer researched the issue and determined that GM is reccommending the Dextron, we have it on order as they do not stock this oil, I will let you know when the service is completed and if it took care of my issue!!
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post #7 of 9 (permalink) Old 08-08-2011, 01:01 PM Thread Starter
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After changing the rear differential fluid, I was still hearing the buzzing from the rear of the car. The GMC dealer called the local Caddy dealership to verify they had a factory trained XLR Tech, which luckily they have 2. The GMC folks thought that the differential needed to opened and inspected. They don't work on Corvettes so they do not have the rack needed lower the rear end. I left the car at the Caddy dealer this am, they have called and said that it was the left rear wheel bearing, which they are now replacing. I will let you know if this was the real problem, a Corvette maniac friend of mine never thought it was the differential, he was all about the rear wheels... I will let you know tomorrow when I pick the car up if the problem has been solved. BTW, the buzzing noise would start around 30 and at 70, it would get very, very quiet, you have to listen closely to hear it.
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post #8 of 9 (permalink) Old 08-10-2011, 06:38 AM Thread Starter
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Problem solved the buzzing noise was the left rear wheel bearing.
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post #9 of 9 (permalink) Old 06-02-2019, 04:21 PM
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ruff grabbing at the rear of my 06 XLR

My xlr was sitting for a month before I start to drive it again. When I got in it to move it, it seem like I was moving it with the emergency brake still on. after I drive it for a while then it ride fine. But when I stop and move it again it began to do the same thang until I drive for a while. Help!!!
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