[suzook]

I have multiple complaints through my dealer for this problem. In the near future, I will be draining, and adding amsoil. If it blows, PROVE it that I changed the oil. F them. Just fix my godamn rear.

[6spdhyperblue]

Originally Posted by suzook

I have multiple complaints through my dealer for this problem. In the near future, I will be draining, and adding amsoil. If it blows, PROVE it that I changed the oil. F them. Just fix my godamn rear.

That's what I would do. Keep adding additive until it goes away. This is how it's been done since the 70s..at least

[camaro5]

Originally Posted by suzook

I have multiple complaints through my dealer for this problem. In the near future, I will be draining, and adding amsoil. If it blows, PROVE it that I changed the oil. F them. Just fix my godamn rear.

I doubt it will blow - worst case scenario.

I want you to get back to enjoying that gorgeous HBM Camaro SS , that's all.

Originally Posted by Nicul15

That's what I would do. Keep adding additive until it goes away. This is how it's been done since the 70s..at least

Yes. Not a new issue. The diff isn't the latest Spacex Launch vehicle rocket.

KISS - Change the fluid you are using.

YMMV

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[suzook]

Originally Posted by camaro5

I doubt it will blow - worst case scenario.

I want you to get back to enjoying that gorgeous HBM Camaro SS , that's all.

Oh, I am enjoying, no doubt. I just want gm to step up, and fix the issue. It doesn't affect driveability. After it warms up, its fine. Thing is, its NOT normal, and gm is in its own way telling me to go f myself. I can't bring myself to ever buying another gm product again, if they don't do the right thing.

[camaro5]

Originally Posted by suzook

Oh, I am enjoying, no doubt. I just want gm to step up, and fix the issue. It doesn't affect driveability. After it warms up, its fine. Thing is, its NOT normal, and gm is in its own way telling me to go f myself. I can't bring myself to ever buying another gm product again, if they don't do the right thing.

I understand. I've been there. 33 years ago.

3rd gen Z28 was such a pos, I got a job at the dealership and went to college just so I could get my Camaro right.

After 3 years of wrenching on that thing, researching every tsb, every possible update, tweak, etc -

Valve seals twice - computer carb from hell -boiling fuel in carb -ETC, ETC, ETC

Traded it on a new Toyota Supra Turbo that was nothing but pleasure. Ran like new 5yrs w/ 60k miles. Cruised it at 135 in the AZ desert for 30 straight min.

0 - Zero trips to dealer No Warranty service ever - That is perfection.

So I get you! Hopefully you'll get the results you're looking for.

[Brewmaster]

FYI
Jason,

The Severe Gear 75W-90 and slip lock would not be recommended for your differential as it calls for a specification that our products do not meet at this time.

Please let me know if you have any further questions.

Thank you and have a great day,

Alex

Alex Thompson
Technical Services Representative

AMSOIL INC.
ADDRESS: One AMSOIL Center, Superior, WI 54880
E-MAIL: athompson@amsoil,com
PHONE: 715-392-7101 Ext. 6092
FAX: 715-399-6531

[BlueCamaro6]

Originally Posted by camaro5

If using GM fluid, note the part numbers required from the Owner's Manual:

Correct:

Rear Differential Fluid 75W-90 Limited Slip (GM Part No. 88900401, in
Canada 89021678).



Add Limited Slip Additive GM Part No. 88900330 in Canada 00992694




I've seen posts where dealer used incorrect
ACDelco
Manufacturer's Part Number:88862624

with no additive. This gear oil included lsd additive already in it.

Incorrect:

Fluid 88862624 has been used in the original diff fluid swap and two rear diff replacements on my vehicle. GM called me the other day stating they will only repair the car, no negotiation or compensation for my continued problems with this vehicle. BBB Auto Line has now opened a case and will proceed with a Lemon Law buyback on my 16SS.

[stook2001]

Hi Alex,
You have significantly peaked my curiosity. Can you clarify your comment below or give a little more information for us? Is it that you guys don't know if Severe Gear meets the GM spec and/or it hasn't been tested for the spec (ie. trying to dodge liability risk for owners using your product, understandable of course!)? Or is there something special about GM's spec that you know Severe Gear explicitly does not meet?

Also, which spec are we talking about? Any further information you are able to provide would be very much appreciated as many of us are trying to understand (or at least I am) whether there is a specific reason for the somewhat unusual specs of the GM fluid or if it is just a low quality fluid.

Originally Posted by Brewmaster

FYI
Jason,

The Severe Gear 75W-90 and slip lock would not be recommended for your differential as it calls for a specification that our products do not meet at this time.

Please let me know if you have any further questions.

Thank you and have a great day,

Alex

Alex Thompson
Technical Services Representative

AMSOIL INC.
ADDRESS: One AMSOIL Center, Superior, WI 54880
E-MAIL: athompson@amsoil,com
PHONE: 715-392-7101 Ext. 6092
FAX: 715-399-6531

[AndyUK]

this seems to be pretty confusing - the manual on the GM Europe website and the GM US website for the 2017 model still state to use 88862624

only the US manual for the 2016 MY has been updated to say 88900401 with 88900330

[camaro5]

Originally Posted by BlueCamaro6

Fluid 88862624 has been used in the original diff fluid swap and two rear diff replacements on my vehicle. GM called me the other day stating they will only repair the car, no negotiation or compensation for my continued problems with this vehicle. BBB Auto Line has now opened a case and will proceed with a Lemon Law buyback on my 16SS.

Thank you for posting that.

Wrong fluid from assembly line and/or service could absolutely be the cause.

Make sure the correct fluid is used.

Document that for your BBB case.

3 Diffs total

ps - 88862624 is NOT a API GL-5. It does NOT meet required specs. Case closed.

[Masa]

Same rear end issue. Starting happening after about 3000km.

After morning cold start and allowing the car to warm up for a few minutes you experience a loud vibration/hum coming from the rear end of the car. To duplicate you simply stop and then begin to move and turn left or right. Low acceleration will duplicate it every time. Initially only last 2 or 3 turns and now it last 10 minutes before the sound dissipates.

Couple of other key points:
-happens whenever you leave the car for an extended period time, not just in the morning.
-was not present at all for the first few thousand km.
-progressively getting worse as the days pass.

It's currently in the shop and they are trying to figure out the problem. Disappointed to hear a lot of you are not getting your cars fixed. I do expect a fix since I'm not handing GM that kind of cash for a brand new car with this type of issue.

Update: Some guy on Youtube said there is a service bulletin to replace rear diff fluid: 09-04-20-001E

[Techn9cian805]

Well, its basically spring again where I live with nights being as low as 60 degrees, and since it started to stay above 45 degrees, I've noticed the rear end groan has not returned, so clearly the cold weather is a factor and without it, its like it never happened... now the dealer will never be able to replicate the issue. guess in good weather, that's a good thing right? it seems that this groan issue became more common as winter came.

[Crystal]

Around 3000 miles my SS started making a groaning noise when turning. Sent it in and they changed the fluid multiple times and it isn't better. The last time the dealer had it, for the fifth time, they kept it for 3 weeks and said it was a tire issue so I had to replace the tires with all weather tires and that would fix the noise. Not thinking this was the solution, I refused to pay for the tires and told them they should put on the tires, they did and guess what......didn't fix the noise. Glad I didn't purchase them as they said it was the solution. Now they have the car again for the sixth time saying they can't isolate the noise to the rear end and that since the noise goes away after ten minutes of driving it this is what it is and they can't do anything about it. Not all the camaros make this noise but they say I have to live with it. The car sounds like crap when I drive it around town but it is normal according to them. Yup a really expensive vehicle that makes noise is what I get from GM. I asked to get out of the lease but nope. They told me it was tires and it wasn't they told me it was the fluid and it wasn't, now they are telling me it is safe to drive....I am not believing them. A vehicle with less than 5000 miles shouldn't make noise and they have been wrong about it the entire time but I should trust them with my life.

I am unhappy from the response of the dealership telling me to deal with it. I opened a case with customer service and they sent me back to customer service at the dealership as the point person....yeah that is helpful, they haven't done anything before. I have 3 Chevy vehicles in my driveway but when there is a problem this is the response, just deal!!! We won't buy GM again.

[AndyUK]

just do burnouts till it explodes and the sue them for wreckless endangerment for not fixing it sooner