1984 catalina 280 transmission

Paragon, Borg, Chris, others...
Should be a tag on it.
If not, send us a picture.

ZF? Maybe, but unless it was re-powered, it may be to old of a boat for a ZF.
There are tags on ZF clutches also.
What engine?

ZF took over Hurth a ways back.
Some cases are the same, some were dropped. Lots of model numbers were changed on the surviving cases.
Unless the boat was re-powered with a newer setup, from 1984 on a chevy V-8 was usually Borg or Paragon.
Please send pictures of the gear, engine and all tags.

FM, that is a ZF clutch.
Series 25 thru 45A.
Find the tag on the clutch and call a ZF Marine shop for the correct model number.

Later Chevy small block.
Vortec heads and intake manifold.
Not original engine package.

I remember looking at this sad package before. Thought (hoped) we talked the guy out of it.