Being able to see what's going on inside the bell housing will help tremendously. Instead of a hole saw, a usb borrscope / laptop and a 1/2 inch strategically drilled hole will end up with smaller hole.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked