Ok,so I have some SJ manual hubs off Ebay for my Jimny, one of the adapter kits and 4 hours to myself, so I decided to have a go at fitting them today.
After doing the drivers side I jacked up the whole side of the car and put it in 4 wheel drive, started the engine, put it in 1st gear and presto, both wheels turning (with the front hub in lock mode).
After doing the passenger side I did the same test but only the rear wheel was turning so I thought "great, duff front hub" !. But after removing the hub and doing the test again I noticed that the splined shaft wasn't turning even though the shaft between the transfer box and the diff was turning.
Now correct me if I'm wrong but I presume this means I have a broken drive shaft ?.