Riviera 1965 with the 3 speed TH400 transmission. When driving I noticed a tapping noise.. Engine linked as increases with engine speed... Sounds exactly like a tappet noise.... But it isn't...
It's coming from the gearbox. Sometimes it goes away. It's there while driving or in park and increases as the engine revs... Can't hear it at idle.
Jacked up a rear wheel and put gearbox in neutral engine stopped and turned the raised wheel... There is the tapping noise again from inside the Gearbox.... Any ideas?
Car drives well, changes gear fine, oil levels good, fluid clean.