This is a flex plate. It connects your engine crankshaft to the transmissions torque converter. And ..balances out things to a degree.


These do crack at times and can give off a rattling noise. I'd hope this is what the issue is..or maybe a loose flex to conveter bolt (you can check these from underneath the car with a 10mm, 18mm (wrench) and a decent sized flat head screw driver).

If you have to put another flex on, you either lower the trans or raise the engine.