Rear Diff Groan by the numbers - Page 11

crosive · 05-07-2018, 03:20 PM

I was told that the bulletin stated to drain and fill dif, do 5 figure 8s. Do that whole process up to 5 times. If that didn't work, new dif.

Kise · 05-09-2018, 12:40 PM

anyone have the specific TSB for the fix?

crosive · 05-09-2018, 12:46 PM

Quote:

Originally Posted by Kise

anyone have the specific TSB for the fix?

It's on my paperwork at home, I'll put it here when I get off work if someone hasn't already

wingchunsifu · 05-09-2018, 05:42 PM

The second flush at the dealer seems to have eliminated the groan. Fingers crossed it stays that way

crosive · 05-09-2018, 06:13 PM

According to what they did to mine, it says "rear diff fluid needs to be drained and refilled per 17-na-287"

67rstbkt · 05-10-2018, 10:21 AM

I took my 2016 in yesterday for the groan - they gave it back to me as no problem found. I provided them the GM documentation on the issue, but could not locate the TSB if there is one?
My issue presents when the temperature is low, so I can understand not being able to duplicate, but I would think the low cost of a fluid change would have been good customer service. The service writer was very dismissive and just told me I have plenty of warranty left, because my time is obviously worth nothing to them.

crosive · 05-10-2018, 10:34 AM

Quote:

Originally Posted by 67rstbkt

I took my 2016 in yesterday for the groan - they gave it back to me as no problem found. I provided them the GM documentation on the issue, but could not locate the TSB if there is one?
My issue presents when the temperature is low, so I can understand not being able to duplicate, but I would think the low cost of a fluid change would have been good customer service. The service writer was very dismissive and just told me I have plenty of warranty left, because my time is obviously worth nothing to them.

"Low cost" was $165 for me when I had my dealer change it, unrelated to the groan, at 1500 miles.

Mine started only in cold weather, never in warm weather. It progressed to where it did it when the car itself was not warmed up, even in 70 degree weather for the first few turns

67rstbkt · 05-10-2018, 01:29 PM

Quote:

Originally Posted by crosive

"Low cost" was $165 for me when I had my dealer change it, unrelated to the groan, at 1500 miles.

Mine started only in cold weather, never in warm weather. It progressed to where it did it when the car itself was not warmed up, even in 70 degree weather for the first few turns

I meant low cost for them - 2 quarts of gear oil is less than $30 to them, plus 20 minutes of time. Even at $165 it's low cost in my mind to take care of a customer who spent in excess of 40,000 on a vehicle. It's terrible customer service.

crosive · 05-10-2018, 01:36 PM

Quote:

Originally Posted by 67rstbkt

I meant low cost for them - 2 quarts of gear oil is less than $30 to them, plus 20 minutes of time. Even at $165 it's low cost in my mind to take care of a customer who spent in excess of 40,000 on a vehicle. It's terrible customer service.

oh yes. yes. even if it cost them $180, your point is still valid

Kise · 05-11-2018, 07:32 AM

well they basically told me sorry about your luck and there is nothing we can do and nobody to escalate it to.
after the first two flushes making it worse and not only making a groan but now a grinding noise on right turns they tell me "its a characteristic of the vehicle."

crosive · 05-11-2018, 07:58 AM

Quote:

Originally Posted by Kise

well they basically told me sorry about your luck and there is nothing we can do and nobody to escalate it to.
after the first two flushes making it worse and not only making a groan but now a grinding noise on right turns they tell me "its a characteristic of the vehicle."

that's a bullshit answer. I'd find another dealer.

Driski · 05-23-2018, 04:26 AM

Quote:

Originally Posted by Kise

well they basically told me sorry about your luck and there is nothing we can do and nobody to escalate it to.
after the first two flushes making it worse and not only making a groan but now a grinding noise on right turns they tell me "its a characteristic of the vehicle."

This ^ is what i am afraid of... I had my entire diff changed late 2016 and it was quite until i took her out of storage this spring. They did a flush and it is worse. They are telling me i need to bring it back in for them to diagnose again. I hope they just skip all the BS and replace the rear diff and i don't get another groaner.

SmAC · 06-10-2018, 07:20 AM

Quote:

Originally Posted by Kise

well they basically told me sorry about your luck and there is nothing we can do and nobody to escalate it to.
after the first two flushes making it worse and not only making a groan but now a grinding noise on right turns they tell me "its a characteristic of the vehicle."

Well if they all do it I guess it is a characteristic....

Kidding

Mine does it and I'm not really worried about it any longer

jcor3 · 06-12-2018, 11:41 AM

My 2018 is doing it. Especially first drive of the day turning left, which is what I do every time I leave the house...

View Poll Results: Rear Diff groan by the numbers
I have NEVER had the groan	135	27.27%
I have the groan and need to take the car to the dealer	211	42.63%
I have changed the diff fluid and do not have the groan	39	7.88%
I have changed the diff fluid and the groan returned	53	10.71%
I have changed the rear diff completely and do not have the groan	11	2.22%
I have changed the rear diff completely and HAVE the groan	25	5.05%
I have changed the diff fluid more than once and do not have the groan	5	1.01%
I have changed the diff fluid more than once and have the groan	8	1.62%
I have changed the rear diff completely more than once and do not have the groan	3	0.61%
I have changed the rear diff completely more than once and HAVE the groan	5	1.01%
Voters: 495. You may not vote on this poll

05-07-2018, 03:20 PM	#141
crosive Drives: 18 zl1 Join Date: Aug 2017 Location: central alabama Posts: 935	I was told that the bulletin stated to drain and fill dif, do 5 figure 8s. Do that whole process up to 5 times. If that didn't work, new dif.

05-09-2018, 12:40 PM	#142
Kise Drives: 16' 2SS, 06' Silverado SS Join Date: Jul 2017 Location: Columbus, OH Posts: 345	anyone have the specific TSB for the fix?

05-09-2018, 05:42 PM	#144
wingchunsifu Drives: 2017 2SS A8, 2018 Macan GTS Join Date: Sep 2017 Location: New York Posts: 133	The second flush at the dealer seems to have eliminated the groan. Fingers crossed it stays that way

05-09-2018, 06:13 PM	#145
crosive Drives: 18 zl1 Join Date: Aug 2017 Location: central alabama Posts: 935	According to what they did to mine, it says "rear diff fluid needs to be drained and refilled per 17-na-287"

05-10-2018, 10:21 AM	#146
67rstbkt Drives: 2016 Camaro 2SS, 1967 Firebird Join Date: Nov 2017 Location: Northern Nevada Posts: 43	I took my 2016 in yesterday for the groan - they gave it back to me as no problem found. I provided them the GM documentation on the issue, but could not locate the TSB if there is one? My issue presents when the temperature is low, so I can understand not being able to duplicate, but I would think the low cost of a fluid change would have been good customer service. The service writer was very dismissive and just told me I have plenty of warranty left, because my time is obviously worth nothing to them.

05-11-2018, 07:32 AM	#150
Kise Drives: 16' 2SS, 06' Silverado SS Join Date: Jul 2017 Location: Columbus, OH Posts: 345	well they basically told me sorry about your luck and there is nothing we can do and nobody to escalate it to. after the first two flushes making it worse and not only making a groan but now a grinding noise on right turns they tell me "its a characteristic of the vehicle."

06-12-2018, 11:41 AM	#154
jcor3 Drives: 2018 2SS & 2002 1500HD Join Date: Jan 2018 Location: California Posts: 9	My 2018 is doing it. Especially first drive of the day turning left, which is what I do every time I leave the house...

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