All Land rovers suffer from clonks in take upo of drive. Most common is that the gearbox mainshaft not only wears itself but also wears the input gear of the transfer box. They can also exhibit this problem from other parts such as drive shaft and drive plate spline wear, worn radius arm bushes, A frame top ball joint, engine and or gearbox mountings. If the clonk is coming from the prop shafts, then by the time you hear or feel the clonk, the prop shaft is propably for throwing. They have big problems with prop universal joints and usually are replaced quite often.
Hope this helps
Its cheaper to get a recon part.
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Are you sure the noise is coming from the transfer box itself ?, it could be coming from a worn universal joint or UJ as they are known that are situated at either end of the propshaft, UJ's are about £10 pounds and a couple of hours labour could solve your fault
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