Having same issue here, as far as I'm concerned all the gears appear really sticky.
As for the grinding, this seems to happen anytime the RPMs are up there, and I want to let loose reving high and then slamming into a higher gear.
Just happened earlier shifting from 3, 4 to 5 (grind), N, 5 again.
My approach will be to discuss with my performance mechanic.
Word of advice don't deal with day to day mechanics at a GM dealership. These vehicles are high performance race cars that are tuned to run like street vehicles. Do yourself a favour and find good performance installer in your area and have them tune the vehicle the way you like it.
My installer has a Camaro SS they work on regularily and have done hundreds of tunes on it, with varying combinations of aftermarket parts. I drove their car and shifting gears are smooth like butter (stock).
My opinion is there is nothing wrong with the vehicle, it's the vehicle's tuning from the manufacturer that's the problem.
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