If there's a clunking you've got play somewhere.
Check your rear driveshafts at the outer ends (front ones are usually okay due to oil leaking out to them from the front axle but you can have a look)
Take off the rear wheels you'll see what's called the "drive member" in the centre of the axle, remove the five bolts and you'll most likely find the sliding joint is full of brown powder.
Fit two new drive members and don't forget the paper gasket. The driveshafts are usually okay.
Its surprising how much better a Defender drives when worn drive members are replaced. They are under £25 each. Transform the vehicle for £100
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