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09-25-2025, 07:16 AM
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#1 |
 Drives: 2014 ZL1 Join Date: Feb 2021
Location: Austria
Posts: 3
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Problems with differential
Hi, Iīm from Austria/Europe and have a 2014 ZL1. For month I have big problems with the differential. It has been rebuilt 3b times, the last time with a Elite Master Kit, and still there is a lot off noise and loud clacking. Now the technician thinks, the BRM polyurthan bushings are the causing the problems? I canīt find any stock bushings anymore.
The clacking comes when you release gas pedal and the rest of the time itīs a singing noise. Any idea what we could do? |
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09-25-2025, 08:34 AM
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#2 |
        Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017
Location: Huntsville, AL
Posts: 2,450
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Have you checked the outer hub bearings? Problems there can sound like diff noises especially with aftermarket bushings.
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09-25-2025, 11:27 AM
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#3 |
Drives: 2011 Camaro 2SS/RS Join Date: Jul 2021
Location: McKinney, TX
Posts: 517
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Also a couple of possibilities in the way of incorrect pinion depth. Maybe have him show you how he's marked the gears and assuring correct mesh. Plus that coast whine/noise you talk about can be indicative of certain gear sets? What did you put in? As example, I went to 3.91's. I started with Motive. My guy went through 3 gear sets and never could make it quiet. And he was very confident in his work. His shop is very well known specialty in Camaro and Corvette trans, clutch and drivetrain in general. I had him try again with a GM set and it's quiet as it should be now.
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09-27-2025, 11:50 PM
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#4 |
 Drives: 2013 ZL1 Join Date: Nov 2015
Location: Northeast
Posts: 79
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Wait...are we all talking about a ZL1 diff?
What is an "elite master kit"? |
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09-28-2025, 05:53 PM
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#5 | |
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Drives: 2011 Camaro 2SS/RS Join Date: Jul 2021
Location: McKinney, TX
Posts: 517
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Quote:
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09-29-2025, 09:36 PM
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#6 | |
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Drives: ZL1, 2013, tri-coat-red, manual Join Date: Nov 2013
Location: Michigan
Posts: 1,665
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Quote:
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09-30-2025, 09:11 AM
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#7 |
 
Drives: 2010 Turbo LS3 Join Date: Dec 2009
Location: Palm Bay, FL
Posts: 3,041
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Unless things have changed, only gears available for the ZL1 are factory units from AAM in 3.23 and 3.73 ratios.
I have BMR poly bushings and no noises, now if you go with the Delrin units, they will tell you everything you never wanted hear in your diff. axles or hubs are a possibility, but could be rear is set up wrong. A lot of mechanics struggle with IRS diffs.
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2010 SS - Kind of an On3 kit, CTR 78/80, CompCam 239/251 620/632 122+4, E85, Z28 suspension and ZL1 diff with Outlaw axles. Gen6 ZL1 brakes.
2011 Vert - 416/w 230/236 .612/.602 115lsa, 1LE suspension w/32mm rear bar. Z28 diff. Gen6 ZL1 brakes. |
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