I have had to travel this evening for work next week - a 250 mile trip. I am away all week.
About 100 miles into my journey the D2 (TD5 manual/R380) started making a fairly bad noise. Rotational knocking probably best describes it. Changed out of 5th gear and it went away. Quiet as a mouse in 4th, 1st-3rd were fine too. This leads me to think the layshaft bearings are pretty bad as it is only in 5th gear. It is on about 160k so its done ok to be fair.
With not much choice this evening, I did the last 150 miles of this journey in 4th gear running at about 60mph. On Friday I need to make the return journey. What's the likelihood the layshaft bearings will hold up if I don't use 5th and go no higher than 4th gear on a 250 mile run?