Flex Plate location?

I recently bought an 81 300td that has a 118 transmission. When driving, there is a bad flare between 1st and second and the car "clunks" like I am dragging a can of paint under the shifter. I read (/node/49) the flex plate torque converter page and thought that may be my problem. But I can't figure out where the blasted thing is so I can check it...and if it needs replaced or needs new bolts, Kent, do you have those handy? I did just finish changing the transmission fluids and filter, oil and filter, and the inline fuel filter. I don't want to go any further until I get the transmission working. Please help...I am a newbie getting in over my head!

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