The C30 yahoo group might help you out. The C36 skippers have had remarkably numerous transmission
issues, but usually on the later engines. www.catalina36.org
The C310 group with M25XPAs have also had issues. CatalinaOwners.com - Home
, find their tab under the Forum tab, upper left.
We simply haven't had those issues, but feel free to look around our C34 tech wiki: Engines 101 - The BIGGEST & BEST collection of M25 Series Universal Engine
Information on the Internet
, plus some M35, too
Diesel Engine - C34
The key seems to be, in a rebuild
, the type of replacement clutch
material you get.
The larger ZF10 fits, IIRC.