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Old 02-27-2023, 12:18 PM   #3
jeffrop
 
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Drives: 2020 ZL-1 M6
Join Date: May 2013
Location: Northeast Ohio
Posts: 48
Any update on this? I just picked up a 2020 ZL1 manual and getting loud "whirring" sound, almost like a siren really at highway speeds (60+) from the rear.

Tires are Toyo Proxes but I don't think it's the tires. It has to go into the dealer tomorrow for a defective trunk release so I'm going to have them check out the rear diff
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