I will replace it for a Twin Disc ( Technodrive) transmission
. Many engine
manufactures that used to install Hurth
(now ZF) are switching to this one (Betamarine, Phasor,etc..). Apparently the parts
are now made by a different manufacturer, which has affected quality and reliability
TD are direct replacements
. The only difference is coupling height. This means that the engine
should be lowered or raised around 1/4", depending on model. Plus, they are a bit cheaper!