sorry about the diff confusion, i'm not really sure what you upside down folks :p call diffs but here in England it's the piece with the mechanicals that bolts into the centre of the axle casing (contains the crownwheel and pinion etc)...
these are easily swapped into the Series axle tubes/cases as long as they accept 10 spline halfshafts
to swap the front one all i did was unbolt the swivels from the axle tube and carefully pull them a couple of inches out and then balance them on a pair of axle stands whilst i pulled the old diff and fitted the new one, to seal the swivels back to the axle i just ran a little silicone round the mating face before sliding it back into place
a picture (click to enlarge)
https://www.aulro.com/afvb/images/im...011/06/606.jpg

