OK afew things to watch out for. Any clonks underneath, when you select drive and/or reverse, will probaly be the front mounting rubber on the rear axle. Its common, but good news they are about £12 or 420 or so to buy and you can the do the job yourself with very few tools. Just a bit of patience.
Make sure you change the engine oil regularly, at least every 10,000 miles and use a fully synthetic 5w 30 or similar. If the auto box is OK, then leave it well alone. My TD4 Auto has just failed at 53,000 miles, after I decided to change the oil. It is a JATCO autobox and although Landrover say change the autobox oil at 60,000, there is a debate as tro whether you should do this. JATCO indacte that their boxes require no oil changes. Some others, say change the oil every 30,000. I tried the oil change as I started to get a fault on 4th and 5th gear, and hoped it would clear. Wrong, it caused a bigger failure. In the UK we have a great JATCO remanufacturing workshops, so the full replacement should only be about £1400.
I know it sounds pretty bad, but actually, these cars are really very good overall, if you have them loked after. If yours is OK, enjoy.