Chevrolet Silverado Flexplate Replace/Remove

When I'm Going Down The Highway At 62 Mph And Faster There Is This Horrible Vibration Throughout The Cab Of The Truck. Oh This Is A Chevy...

Starter Been Dragging For Couple Days, Now Has That Tinging Sound When Stepping On Gas Pedal. Shift To Neutral And Sound Almost Goes Away....

When You Are Switching Out Transmissions Do You Really Have To Mark The Flex Plate And The Torque Converter? I Mean Everything Is Already...