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Ok, I am noticing a grinding feeling when I pull out of parking spots, is this my rear end binding, or something else (transfer case, front diff.)? It's hard to pinpoint. The only time I notice it is when pulling out (left or right) from a dead stop, I thought I avoided problems by changing the fluid early but I don't think it helped.
 

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I am not convinced that it can be stopped...people have tried all of the different fluids I think that may just "slow" it down
 

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I am not convinced that it can be stopped...people have tried all of the different fluids I think that may just "slow" it down
That's because you have not tried GL-100. You put that in, the noise will stop forever and you will get better mileage.
 

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That's because you have not tried GL-100. You put that in, the noise will stop forever and you will get better mileage.
I am open to trying different products...if when I research it I find a compelling reason why...
Now if you can explain better than VP can, I am all over it but being it is a Semi-synthetic and not a full synthetic how is it better??
And do you need to add a friction modifier to it ??

http://http://www.vpracingfuels.com/vp_02_oils.html#specialty VS. http://http://www.schaefferoil.com/gear_oils/167_gear_oil.html
and a bunch of technical info http://http://materials.globalspec.com/Industrial-Directory/gear_oil
Have fun and Dive in...:biggrin2:
 

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I am open to trying different products...if when I research it I find a compelling reason why...
Now if you can explain better than VP can, I am all over it but being it is a Semi-synthetic and not a full synthetic how is it better??
And do you need to add a friction modifier to it ??
Well, you have two choices: Try it or don't.

Synthetic is not the end all be all. I have personally tried at least 20 different lubes to quiet noisey clutch chatter in rear ends, especially ones built with lots of preload on the springs. GL-100 is teh ONLY one that ALWAYS works.

On top of that, the cars ALWAYS move easier, less drag, no shit. It works.

If you want professional advertising, go to NASCAR or NHRA, the pro's use it for a reason. It's that good (and it even cost less than royal purple).
 

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Ok, I am noticing a grinding feeling when I pull out of parking spots, is this my rear end binding, or something else (transfer case, front diff.)? It's hard to pinpoint. The only time I notice it is when pulling out (left or right) from a dead stop, I thought I avoided problems by changing the fluid early but I don't think it helped.
Sounds like the rear end TSB issue. I just had mine replaced this past week and I will tell you it feels much better than it did even before the issue started. I'd take it to the dealer and bring in this:

Document ID# 1870450

Subject: Growl groan Shudder or bind from the rear differential when turning - keywords axle chatter cold G86 hot turn #PIP3911A - (11/03/2006)

Models: 2006-2007 Chevrolet Trailblazer SS Equipped with limited slip differential (RPO G86)

Condition/Concern: Same as Subject

Recommendation/Instructions:

Replace the rear differential center section (gear case) which will include clutch plates and springs with an updated spring rate. At the time of the release of this PI all parts in GMSPO stock have been purged and ordering the catalog listed part number will insure updated parts. Fill the differential by first installing 5.5 oz (163 mL) of Limited-Slip Axle Lubricant Additive (GM Part No. U.S. 1052358) then fill, 0.6 in. to 1.6 inches below the bottom of the filler plug hole using SAE 75W-90 Synthetic Axle Lubricant (p/n 12378261) meeting GM Spec 9986115.

Note 1: reference the latest version of tsb 06-04-20-003 for proper fluids and capacity.

Note 2: Synthetic Axle Lubricant, p/n 12378261 or p/n 89021677 each of these part numbers is the same axle lubricant, w/ differences in packaging only.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved w/o completing every step, the remaining steps do not need to be performed.

That's what I did and they found it was the exact problem. They ordered the rear end and put it in without any issues from the dealer.
 

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Well, you have two choices: Try it or don't.

Synthetic is not the end all be all. I have personally tried at least 20 different lubes to quiet noisey clutch chatter in rear ends, especially ones built with lots of preload on the springs. GL-100 is teh ONLY one that ALWAYS works.

On top of that, the cars ALWAYS move easier, less drag, no shit. It works.
QUOTE]

1)You must have misread the post...definitely missed the intent...I wasn't ripping it I just like to know what and why.
2) With the warranty issues we have it is prudent to use some caution as not to possibly void it.
3) Make sure that what you use meets the spec. (See number 2)
4) Information is never bad...
5) We probably agree more on this than it seems.

:2cents:
 

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Ok...must have read it a little cock-eyed, sry.

The GM TSB simply puts weaker springs in the center section to decrease the preload, which decreases limited slip engagement as well. The GM tsb does not use lower friction fluid ans as such, the diff still runs at a higher temperature and has more drag than putting the GL-100 in.

I have just seen first hand the benefits of this lube over anything else I have tried (I even tried slick 50, which was the worst junk you can imagine).
 

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Sounds like the rear end TSB issue. I just had mine replaced this past week and I will tell you it feels much better than it did even before the issue started. I'd take it to the dealer and bring in this:

Document ID# 1870450

Subject: Growl groan Shudder or bind from the rear differential when turning - keywords axle chatter cold G86 hot turn #PIP3911A - (11/03/2006)

Models: 2006-2007 Chevrolet Trailblazer SS Equipped with limited slip differential (RPO G86)

Condition/Concern: Same as Subject

Recommendation/Instructions:

Replace the rear differential center section (gear case) which will include clutch plates and springs with an updated spring rate. At the time of the release of this PI all parts in GMSPO stock have been purged and ordering the catalog listed part number will insure updated parts. Fill the differential by first installing 5.5 oz (163 mL) of Limited-Slip Axle Lubricant Additive (GM Part No. U.S. 1052358) then fill, 0.6 in. to 1.6 inches below the bottom of the filler plug hole using SAE 75W-90 Synthetic Axle Lubricant (p/n 12378261) meeting GM Spec 9986115.

Note 1: reference the latest version of tsb 06-04-20-003 for proper fluids and capacity.

Note 2: Synthetic Axle Lubricant, p/n 12378261 or p/n 89021677 each of these part numbers is the same axle lubricant, w/ differences in packaging only.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved w/o completing every step, the remaining steps do not need to be performed.

That's what I did and they found it was the exact problem. They ordered the rear end and put it in without any issues from the dealer.
Is there a way to look out our build date and check to see if our vehicle is in the batch that has this issue? Mine was built around April/May 07.....not sure the exact date.
 

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I took mine in 4 or 5 times for the same thing the first and second time they said they replaced the fluid. Im not sure if they used the GL-100 or not but the noise kept comming back. The last time I took it in they replaced the rear end. That was about 1 1/2 months ago and I have not heard the noise since.
 

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Well that sucks.....I was planning on doing headers, e-fans, and a cai this weekend, but was afraid it might void the warranty and want to take care of anything (like a possible rear end going out) that I needed to. Anyone know if those items would void the drivetrain warranty? I know it "shouldn't" as the burden of proof would fall to the dealership to prove what I did caused the problem...anyone had these mods when they took theres to the dealer for the rear end though?
 
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