might not be the same thing but all the series landys I've had make a clanking noise when you take you foot off the accelerator, mainly down to backlash in the transfer box and diff and all the other badly fitting bits, not much you can do about it tbh it's just normal
many folk seem to panic about using 4wd on road but so long as the roads a bit slippy from the rain etc they are fine, it also handles vastly better too in the rain at high (landy high) speeds, i.e 4 wheel drifts round country roads
considering some of mine were utter piles of worn out junk then using 4wd on the road if it was going to break something would have
low ratio is also very good in traffic jams as you can pop it into low and let it idle away rolling along at less than walking speed, better than an automatic