Hi David, it sounds like you need to have a look at the bushes between the gearbox (LT77) and the remote gear change. This might explain the poor gear change and perhaps the clicking noise may come from contact between the remote and the propshaft universal joint. Lots of information here.
https://www.gomog.com/allmorgan/remoteissues.html.This is a well known problem, but fixable. Regards.
