[leadfoot93]

Originally Posted by SSport16

Good to hear, hopefully it will stay away for good!

I'm sure I jinxed myself and it'll be there waiting for me when I go home tonight LOL

[MR 45TH]

Originally Posted by leadfoot93

Just a update after doing my second flush about 3weeks ago, the cold weather has been with us in NY the past 2 weeks and the groan has not come back yet.

Very good to hear! Which fluid did you use?

[keon718nyc]

Originally Posted by MR 45TH

Very good to hear! Which fluid did you use?

Yes please let us all know, also did you do it yourself or dealer both times it was changed? I had mine changed once from the dealer with no luck of the groan sound going away.

[leadfoot93]

I used the ACDelco 88862624 both times, That's what my owners manual said to use. I changed it myself because I didn't trust the dealer to do it nor did I want to sit there for hours for a job that takes less then 15 minutes LOL!

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

[MR 45TH]

Originally Posted by leadfoot93

I used the ACDelco 88862624 both times, That's what my owners manual said to use. I changed it myself because I didn't trust the dealer to do it nor did I want to sit there for hours for a job that takes less then 15 minutes LOL!

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

While others have used GM 88900401 with 88900330 additive. I guess at this point it's just a shot in the dark

[stook2001]

Originally Posted by stook2001

I believe you are supposed to use the full additive bottle (it's a small bottle).

However, aside from what is normally called for, it is generally advised to use the least amount possible, adding a little at a time until there is no more binding. There are 2 reasons for this. The main reason is because it reduces the locking functionality of the diff, which is not desirable so long as it isn't binding. The second reason is that it alters the properties of the gear oil itself, which is something that you don't want to be doing more than necessary.

Ok guys, I have an update already. On my 2nd real drive with the car I had some groaning from the diff. Strangely enough, I didn't notice anything during the first drive.

Debating whether to drive it a couple of more times to see if it dissipates, since I have read that some people have noticed it takes a couple of drives for the groaning to go away... or I may add some more of the limited slip friction modifier (I used half of the delco additive bottle).


Edit: haven't driven the car since I posted until today. no groan even though the weather is cold. not quite sure what to make of it. probably going to give it a few more drives.

[camaro5]

Originally Posted by stook2001

Ok guys, I have an update already. On my 2nd real drive with the car I had some groaning from the diff. Strangely enough, I didn't notice anything during the first drive.

Debating whether to drive it a couple of more times to see if it dissipates, since I have read that some people have noticed it takes a couple of drives for the groaning to go away... or I may add some more of the limited slip friction modifier (I used half of the delco additive bottle).


Edit: haven't driven the car since I posted until today. no groan even though the weather is cold. not quite sure what to make of it. probably going to give it a few more drives.

Too bad it doesn't seem to have worked...

I just found GM's procedure for this noise correction - you're gonna love it!

Moan noise from the rear axle during cold start turning maneuvers.

In some instances the noise has been described as coming from the front of the vehicle.

The noise may start to be noticed as the vehicle accumulates over 3,000 miles.




Note: Steps 2 – 9 MUST be performed two (2) times for a total drain and fill of three (3) times to have this procedure be effective.

With original lube in axle, conduct Freeway Speeds for 10 miles to warm up lube.

Immediately drain original lube and refill with fresh lube

In parking lot lock steering to the right, and then execute 5 Full Circles at (5-10 mph).

In parking lot lock steering to the left, and then execute 5 Full Circles at (5-10 mph).

Perform 4 Figure 8’s at (5-10 mph).

Freeway Speeds for 20 miles until operating temperature is achieved.

In parking lot lock steering to the right, and then execute 5 Full Circles at (5-10 mph).

In parking lot lock steering to the left, and then execute 5 Full Circles at (5-10 mph).

Perform 4 Figure 8’s at (5-10 mph).

Immediately drain current lube in axle and refill with fresh lube

Perform Steps 3 thru 9 again.

Immediately drain current lube in axle and refill with fresh lube.

The figure 8's work the new fluid into heated up clutch plates.

It should be made clear that there are 2 issues being addressed:

1. LSD clutches grab on corners when cold - Better fluid is the only hope. Insane fluid change procedure may or may not be required.

2. Ring and pinion gear whine going straight or on turns - may be cured with better fluid, or may require full diff set-up.


There's talk of the Mexican diffs not being set up properly. Too much Corona...

May need full set up and adjustment including backlash adjustment.

[stook2001]

Interesting that they call for dumping the fluid twice. Not sure what to make of that...Doesn't make a whole lot of sense to me. I'm going to add a bit more friction modifier to my blend since I only half dosed it for my first try. I believe that will solve my issue. If it doesn't, I am going to dump it and try a different friction modifier. And if that still doesn't work, I am going to try out a pre-blended (or same branded at least) gear oil and lsd additive on the remote chance that there is some weird interaction between the lsd additive and the untreated oil. Another option is to try different weight oils than the oem spec, like a straight 90 weight or something like a 75/140... Anyway, I am going to experiment with 1 thing at a time.

I still strongly feel that this issue is fluid related.

[camaro5]

Yes, interesting.

Good chance the cops will see you in the Home Depot parking lot going around in circles 5 times, fig eight 5 times, and take us to the funny farm.

GM recommended this procedure for 5th gens too. May want to check their posts (camaro5.com) on success rate.

It's about getting contaminants out of the housing, but more importantly to get fresh fluid into the friction material by heating it up, and "opening their pores"

[union894]

Well the 3rd time must be.... I'm closing in on 5k miles and nearly 1k miles since the last fluid change, with 45 degree temps the last couple morning's. The only thing that has a groan are my crumb snatchers (aka kids) getting up for school. All Bullsh@t aside, I hope this is the last time I have too deal with the this situation.

Sent from my SM-T900 using Tapatalk

[camaro5]

Originally Posted by union894

Well the 3rd time must be.... I'm closing in on 5k miles and nearly 1k miles since the last fluid change, with 45 degree temps the last couple morning's. The only thing that has a groan are my crumb snatchers (aka kids) getting up for school. All Bullsh@t aside, I hope this is the last time I have too deal with the this situation.

Excellent to hear

[Tim Adams]

Update, I did have mine changed by the dealer even though they could not replicate it. It still makes noise the first couple of turns. I'm just going to keep driving it unless it gets a lot worse.

[sicpuppy]

I took my 2016 Camaro 2ss in for the groan. They said they would change the fluid.

When I picked it up the service guy said the tech. told him it was coming from my Brembo brakes. I told him I had Brembo when I bought the car and didn't have any problem until the last 2000 miles. Also Brembo brakes will not cause the rear diff. to slip under acceleration. Then he told me that I owed $171 for the fluid change.

I told him everyone on the Camaro6 forum were having their fluid changed under warranty. Then he said he would take care of it. We will see.

I must have STIPID printed on my forehead!

[TECHTURTLE]

My dealer told me that they now think the noise is coming from the tires when they are cold... I called Bull Shit.