the noise could be transmission backlash caused by worn axle shafts and drive flanges. Take the shafts out and have a look at the splines and see how much free play you have between the drive flange and shafts, the LR original shafts and not very long lasting. A set of maxidrives could be all that is needed

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1973 series 3 wagon retired
1981 series 3 stage 1 V8 retired
1996 Defender 130 current