Flex plate is correct, and is not the same thing as a flywheel on a manual trans, a true flywheel is heavier and solid to not give under pressure load, a flex plate is the opposite, to allow the converter metal to grow and shrink as fluid pressure is applied harder and lighter to it via engine load, without harming the engine thrust bearings.

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Chris
64 190D R.I.P.
80 240D W/617 engine -for sale
82 240D -for sale