If you are D mode and go to WOT it drops 2 gears so it wont be instantanious, also while in D mode and you go to manual mode it will drop 2 gears. If in manual and you go WOT it should react pretty quick if you are in the right gear and have the rpms up. I get theat metal sound at times too, dont think its anything to worry about.
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2010 LS3 C6 Silver coupe corvette
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