I suspect belt separation on one of your tires.
Or a rock in the tread (but I'm guessing you already checked that).
Edit: When you say the car is put on a lift, do you mean a drive-on lift or is all the weight off of the tires? If all weight is off, then that reinforces my separated ply theory. If it's a drive-on, that makes my theory less plausible.
Last edited by SouthArk370Z; 07-20-2018 at 03:34 PM.
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