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. |
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.
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I thought the rear end now use auto transmission fluid, so only the manual trans uses automatic trans fluid?
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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.
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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! |
Heres the TSB you mentioned for non-ZL1's
http://gsi.xw.gm.com/newsi/images/gmLogoFlat.gif Service Information http://gsi.xw.gm.com/newsi/images/bhome.gifhttp://gsi.xw.gm.com/newsi/images/bpublication.gifhttp://gsi.xw.gm.com/newsi/images/bnumsrchbutton.gifhttp://gsi.xw.gm.com/newsi/images/bnews.gifhttp://gsi.xw.gm.com/newsi/images/ymkbutton.gifhttp://gsi.xw.gm.com/newsi/images/feedback.gifhttp://gsi.xw.gm.com/newsi/images/bhelp.gif 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 |
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Great info, thanks for posting
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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.
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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.
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...was it leaking...why did they have to replace the seals as you stated?
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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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