ha ha ha
thanks, guys - I really appreciate your opinion
I couldn't give a flying wotsit about how the welds look cosmetically - it's only a problem to me if the appearance of the welds might suggest that there is a potential problem with the axle mechanically.
Maybe I could fit this axle and run it for a while and meantime restore the van's original axle? and then re-fit it in a while? I do like using the original parts where possible (just spent not-going-to-tell-you-how-long grinding all the rust off the original U-bolts lol

)
Might make some calls tomorrow, see if I can get someone local to come and look at both the axles and give me an expert opinion.
Thanks also to MoG who suggested putting oil in the "new" axle to see if that removes the clonking in the diff (could be caused simply by metal contacting metal as the diff revolves - there's no play in it)
Tomorrow is another day and this is all supposed to be a fun hobby innit
Night everyone and thanks very much again for all your help and advice, it's really appreciated (don't know what I would have done during this resto without the resource of the lovely peeps on this forum)
wibble xx
