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2006 c6 LS2 Automatic after motor warmed up to 200 when first drive of day 1st and 2nd gear makes slight grinding noise which goes away in 3rd - 6th gears.
After drive for a little while (10 mins or so) when come to a stop and take off again the grinding noise goes away and it drives perfect.
Had trans fluid changed .Motor oil topped off.
Seems like it takes a little for fluid to get to where it has to go for lubrication.
Any ideas would be appreciated.