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In an automatic, the driveline is loaded whenever the car is in gear then accelerated. Pressure is already applied to the entire driveline, and then increased quickly.
In a manual the entire driveline is slack until the clutch is released. You go from zero load, to work, all at once. All the lash in the diff is taken up, all the lash in the trans is taken up, the driveshaft is loaded and power is applied.
The abrupt application of power in the manual versus the smoother "softer" application in the automatic may be why the same potential issue seems different and worse with the manual ZL1. A combination of torque management and traction control/Elsd programming.
I've never experienced this in these cars, just my thoughts from what I've seen posted.
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