2018 ss rear end

[johnfin]

my 2018 ss rear end hit 10k miles and the rear end moans on turns when first driven. same with traction control off. any thoughts

[pajeff02]

Moans? As in the gears or posi unit are making noise?

[johnfin]

how can i tell the difference

[pajeff02]

If it is only making noise in turns, I would suspect a wheel bearing before a posi. If the noise is not constant, then not likely the gears. Another thing to check -- your rear brake calipers. It is not unknown for them to come loose and start making noise before all hell breaks loose.

[35th-ANV-SS]

Isn't a 2018 under warranty?

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[Y2KArcticSS]

Need to take it to the dealer, it needs a fluid swap at the very least. I believe there is a TSB out for rear diff issues. This has been happening since the 2016 release, pretty disappointing to see it still happening in newer models :/

Edit: GM Technical Service Bulletin 09-04-20-001E unless it has been superceded by a newer version, as at the time this was for 2016-2017 models, 2018 hadn't started rolling out yet.

[mrr23]

there is a TSB out about the cv axle bolts coming loose at the pumpkin. they have to replace with longer bolts and lock washers.

[mrr23]

TSB # 16-NA-399

Subject: Information on Replacing Half Shaft Fasteners with Revised Parts



Brand:


Model:


Model Year:


VIN:


Engine:


Transmission:

from


to


from


to

Cadillac


ATS-V


2016


2017


LF3, LF4, LT1, LT4


CTS-V


2015


2017

Chevrolet


Camaro


2016


2017

 

Involved Region or Country


North America and N.A. Export Regions

Condition


The technician may need to perform a repair that requires the half shaft bolts to be removed.
Information


This bulletin advises the Service Technician of new longer bolts and lock washers required to be installed during any repair that requires the half shaft bolts to be removed or replaced.

Three retainer assemblies required per half-shaft.
Each retainer (3) requires 2 bolts (1) and 2 washers (2) to make a retainer assembly.
Where applicable, each axle assembly uses 3 retainer assemblies per side.
Each repair kit contains 6 bolts and 6 washers. 1 kit for each half shaft.
Replacement of all axle bolts are required during repair.

Correction


If half-shaft has been separated from the differential:

Remove and discard only the half shaft bolts.
If required, clean and reuse retainers.
Replace the shorter bolts (1) with a new longer bolt (2) and washer.
Install the lock washers onto the bolts.
Install bolt and washer assembly into retainer.
Torque bolts to proper torque specifications. Refer to Fastener Specifications in SI.

Service stock half shafts may include POA bolt/retainer assemblies. These assemblies may require rework with longer fasteners.

The new half shaft bolts must be removed, measured and discarded if the length is incorrect.

Parts Information

Note: To obtain the bolts and washers, fax the form included in this bulletin to the GM Warranty Parts Center (WPC). Request WPC #816.

Use the Vehicle Identification Number (VIN), SI, and the GM Electronic Parts Catalog to determine the proper part numbers for the half shaft, if replacement is required:

Description


Part Number


Qty

Bolt/Washer


WPC #816


1 kit (6 bolts/6 washers)

 

IMPORTANT NOTE WHEN PRINTING THIS FORM: If the form prints out on two pages, make certain you fax BOTH pages so that the WPC receives all the needed information. Missing information will delay or prevent the part from being shipped.

Parts Request Form – Warranty Parts Center

Use this form ONLY for U.S. and Canadian Dealers. Export markets and Mexico Dealers must contact their regional Technical Assistance Center for assistance.

To: Warranty Parts Center

 

e-mail: warrantypartscenterUSA@gm.com

 

or WPC Fax: 248-371-0192

 

Attn: Temporary Service Parts

 

Part Being Requested: WPC #816 Bolt and Washer kit