Sorry been a bit quiet ....
Spent a bit of time building the unit on the bench to make sure it was going to work, then stripped it, torqued everything up and rebuilt it. Then positioned the crown wheel against the pinion using engineers blue whilst making sure to keep the desired preload on the bearings.
Its a bit of a lump to fit (approx 100kgs) but quite straight forward to fit. I saved the old oil when i took the old unit off, so just reused this with a small top up once the replacement was fitted
Latest update is that everything is fitted and working perfectly :wings:
Took it for its first test run just to a local farm and managed to get stuck in a muddy rut in 2wd...... once the diff lock was engaged it just drove out out easily.
We went down south to Devon and Dorset last weekend so gave it a good road run( approx 500 miles), next job is just to drain the oil and add new fresh EP 80/90.
Heres a few pictures of the final fitment.
I will get round to posting the parts lists and other bits and bobs soon.