If your transmission is original, it is the Roto Hydramatic model 10, known as the "slim jim". Its torque converter (actually a fluid coupling with a simple stator) is inside the transmission, behind the pump. There is a nothing but a damper plate out in front where you would find a torque converter on a more conventional automatic.
The torque converter actually fills and drains in order to shift. It is full in first gear, then for second gear, that coupling empties and a clutch applies that connects the engine directly to the rear wheels through a gear reduction. Then for third gear, the coupling fills again, while that direct clutch remains applied.
This converter is not 'user serviceable', and no high-stall aftermarket parts are available. Unfortunately, cracks in the aluminum coupling housing are common, and the most common symptom is slipping in first gear.
It is attached to the valve body inside of the transmission.
The torque converter clutch is inside the torque converter.The torque converter clutch is inside the torque converter.
Check exhaust hangeers and clamps Check the heat shield on the catalytic converter Cold be a broken baffle inside the muffler
The torque converter solenoid is inside the transmission on the valve body.The torque converter solenoid is inside the transmission on the valve body.
It is inside of and is part of the torque converter.
The turbines inside the converter.
A catalyst
It is inside the torque converter.
The catalytic converter is in the exhaust next to the side of the trans, the torque converter, if automatic, is inside the bell housing.
The stator inside the torque converter directs the fluid at an angle to trans. part of the torque converter amplifying the force on the vanes.
The heat shield on top of the converter may have broken loose. it can be repaired. If the rattling is inside the converter it must be replaced.
TCC - torque converter clutch. It is inside the torque converter between the engine and transmission.