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-   -   Rear Differential Chatter/Howl-Problem Solved (https://www.camaro5.com/forums/showthread.php?t=262301)

ZO6 Bryan 11-23-2012 04:10 PM

Rear Differential Chatter/Howl-Problem Solved
 
6 Attachment(s)
Anyone who can change their oil can and should do this. Took my ZL1 to the dealer to check the rear diff noise and they said they planned to change the seals and diff fluid. 3 hr job to tear out the half shafts and replace seals and use the new fluid. But what they didn't know is the ZL1 already has the new fluid and compatible seals. And I wasn't thrilled at the idea of them tearing it down. So I went out and got some good quality Valvoline Synthetic 75W-90 and did it my self. No more noise, much smoother. Didn't see the sense in dealer putting the same stuff in that was making noise already after 4000 miles. Anyone who tracks should change the fluid regularly. I did one track day since I bought my car in May and just got around to changing the fluid.

Pulled it on ramps on the incline of the driveway so the fluid in the cooler would run to the back when drained.

Both the plugs are magnetic and will have a little debris on them.

Note the top fill plug has a paint mark I assume to keep you from over tightening.

ZO6 Bryan 11-23-2012 04:13 PM

BTW it holds about 2 1/2 quarts. And I took it out for a drive first to warm up the fluid first and it drains very quickly that way.

Skylane765 11-23-2012 04:19 PM

I thought the rear end now use auto transmission fluid, so only the manual trans uses automatic trans fluid?

Stephen12ZL1 11-23-2012 04:20 PM

if it starts making noise when it is cold on slow turns, go to the dealer and get the additive or LS gear oil that has the additive in it already. I tried Royal Purple but it started howling and chattering after a few days when it was cold. Switched back to GM LS gear oil and it was all quiet again.

Stephen12ZL1 11-23-2012 04:21 PM

Quote:

Originally Posted by Skylane765 (Post 5838847)
I thought the rear end now use auto transmission fluid, so only the manual trans uses automatic trans fluid?

incorrect info here

ZO6 Bryan 11-23-2012 04:27 PM

Quote:

Originally Posted by Skylane765 (Post 5838847)
I thought the rear end now use auto transmission fluid, so only the manual trans uses automatic trans fluid?

No, manual calls for 75W-90 gear oil. The oil I used doesn't require any additional additive. And actually the manual calls for additive in the SS but not the ZL1. The GM LS gear oil 88862624 that is recommended for the ZL1 in the manual doesn't require additive.

ZO6 Bryan 11-23-2012 04:29 PM

Copied from owners manual

Rear Axle (V6 Engine with Manual
Transmission)
Rear Differential Fluid 75W-90 Limited Slip (GM Part No. 89021677 and
Friction Modifier 1052358, in Canada 89021678 and
Friction Modifier 992694).
Rear Axle (SS)
Rear Differential Fluid 75W-90 Limited Slip (GM Part No. 89021677 and
Friction Modifier 1052358, in Canada 89021678 and
Friction Modifier 992694).
Rear Axle (ZL1)
Rear Differential Fluid 75W-90 Limited Slip (GM Part No. 88862624, in
Canada 88862625).


The TSB for the rear diff noise has the dealer replace the oil in the diffs of the SS cars with 88862624. Already in the ZL1!

MS3DALE 11-23-2012 05:23 PM

Heres the TSB you mentioned for non-ZL1's


http://gsi.xw.gm.com/newsi/images/gmLogoFlat.gif Service Information
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2012 Chevrolet Camaro | Camaro VIN F Service Manual | Document ID: 2740658
#PI0137C: Rear Axle Chatter Type Noise on Low Speed Turns (Excluding ZL1) - (May 11, 2012)
http://gsi.xw.gm.com/image_en_us/gif.../999999995.gif
Subject:Rear Axle Chatter Type Noise on Low Speed Turns (Excluding ZL1)

Models:2010-2012 Chevrolet Camaro (Excluding ZL1)
Equipped with Limited-Slip Differential (RPO G80)

Attention:For 2010 and 2011 vehicles built prior to August 25, 2010, if the chatter noise you are experiencing occurs only in Reverse while making a turn, please review the latest version of PIC5424.
This PI is being revised to add an Attention statement and update the Recommendation/Instructions. Please discard PI0137B.The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern


Some customers may comment on a chatter-type noise from the rear of the vehicle while making low speed turns.
This condition may be caused by a slip/stick of the posi-traction clutch plates. As the plates slip and stick, a jumping or jerking feel occurs, accompanied by a chatter noise.

Recommendation/Instructions

Caution: The rear axle seals must be replaced. The original seals are not compatible with the new fluid.

Replace both rear axle shaft seals with GM P/N 22798805 and drain/refill the rear differential with new fluid, GM P/N 88862624 (in Canada, use P/N 88862625). Refer to the Rear Axle Shaft Seal and Differential Oil Replacement procedures in SI. This fluid includes a limited-slip additive (friction modifier) already added. DO NOT add any limited-slip additive (friction modifier).
Important: Please advise the customer that once the differential fluid has been changed, it may take as long as 805 km (500 miles) for the lubricant to fully penetrate the limited slip clutch plates. During this period some chatter may still be felt on initial startup while making slow turns until the rear differential fluid warms up.

Note: DO NOT re-use the wheel drive shaft nut. Replace with NEW only.

Parts Information

Part Number



Description



Qty



22798805


Seal, Rear Axle Shaft


2


11611687


Nut, Rear Wheel Drive Shaft


2


88862624 (US -1 qt)

88862625 (Canada -1 L)


Fluid, Manual Transmission (Dexron LS Gear Oil 75W-90 MTF)


1

Warranty Information


For vehicles repaired under warranty, use:

Labor Operation



Description



Labor Time



F9739*


Replace Both Rear Axle Shaft Seals and Drain/Refill Rear Axle Fluid


3.1 hrs


*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

http://gsi.xw.gm.com/image_en_us/gif.../999999994.gifWE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

MS3DALE 11-23-2012 05:29 PM

Quote:

Originally Posted by ZO6 Bryan (Post 5838827)

Note the top fill plug has a paint mark I assume to keep you from over tightening.

Thats a "quality control" mark if you will,it means the diff. has been filled and the plug tightened at the assembly plant.

SlugWound 11-23-2012 08:09 PM

Great info, thanks for posting

DangerZL1 11-23-2012 09:48 PM

The transmission fluid mentioned is only for the diff cooler. I had a Valvoline lube place change mine while I watched using the GM recommended fluid. They said their fluid met the GM spec, but I elected to use the GM fluid instead. It's only about $40 to have them do it versus $100+ for the dealer.

ZO6 Bryan 11-23-2012 10:14 PM

That's right, the ATF is circulated the length of the car not the diff fluid. I had looked at it before but forgot how it was plumbed. So really was no need to lift car and keep it level to drain. Just the rear up in the air would have been fine.

OldScoolCamaro 11-24-2012 06:46 PM

...was it leaking...why did they have to replace the seals as you stated?

ZO6 Bryan 11-24-2012 11:23 PM

Quote:

Originally Posted by OldScoolCamaro (Post 5841982)
...was it leaking...why did they have to replace the seals as you stated?


No leaks. The TSB for the SS cars tells them to replace the seals with new part # to be compatible with the new fluid. The ZL1 already has the new seals.


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