I am quite religious about greasing the six grease points on my '71 4/4 but recently, after a short period of Morgan inactivity I found the steering to be much heavier than it had been previously. All the usual suspects were ok but I realised that I never gave any maintenance to the two UJ's on the steering column. After several liberal doses of ACF50 to each of the UJ's there has been a significant reduction in the "weight' of the steering and my shoulder joints now remain in their sockets!
I offer this to any owners of steering box cars, for what it is worth.