There is a line of bolts or nuts and studs holding the fluid coupling together, on the rim of the coupling just behind the starter gear. They're accessible by removing a sheet metal cover in the top of the bellhousing/transmission case. Take 'em all out- - - -about 30 or so if I remember correctly! The front of the coupling stays bolted to the crankshaft like a flywheel, while the back half is attached to the transmission input shaft by a BIG nut. There's a big rubber O ring that seals the fluid- - - -get a new one from one of the obsolete transmission parts suppliers like FATSCO Transmission Parts in New Jersey.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!