Hi I'm a newbie and I have a problem with my Jimny, please help

The transfer chain slipping makes a loud noise like a machine gun so I very much doubt that is the problem.

The clunk when you stop is a good clue but I can't get my head around it.

It isn't in 4wd is it? They are not designed to run in 4wd unless there is some slip in the road, either dirt, gravel or water. Just checking cos if the car is new to you, you might not know. Sorry for stating the obvious if you are already familiar with the systems.

No it's not in 4wd, I'm into my 4x4's, this is my 2nd Jimny, I've had a Frontera, a Grand Vitara and I currently have a 70 series Landcruiser but I've always loved the Jimny so I got this for a works vehicle.
Never heard anything like this, it's as if a wheel bearing has gone badly but its intermittent and I get the clunk, my gut feeling it's the transfer box but the last lime it did it I could feel the vibration slightly through the steering so I thought it might be something to do with a hub.
I'm baffled.
I'm going to get it up on the ramps again this afternoon and have a good check, any pointers would be appreciated.

Ive had it up on the ramps and this is what I have found, one of the transfer box brackets is broken, wether this is the route of the problem or has been caused by the problem I don't know, there is also an oil leak so I gues the oil seals have gone.
Is this part easy and cheap to get?

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Cool, is this a common problem on Jimnys?, are the oil seals easy enough to replace?, I'm wondering if I can and should do the bearing to whilst it's out