Its prob best if u het ur mates to do the job, it wouldnt hurt to watch them as it would be handy to know down the track. it may be wise to replace the extension casing seal while the shaft is out.

What tools are required to change the UJ? I get a loud clunk when changing from drive to reverse from the drive-shaft, and I have been told this is more likely the case of the UJs failing???

So if I were to do it myself, what tools would I need? and what is involved?