Yes, you do have the BW transfer case. How is it noisy? Bearing whine, loose chain?
The parts to rebuild it are all available, ( for example http://www.ashcroft-transmissions.co.uk/part_88.html )and once it's out of the car shouldn't be particularly tricky if you are mechanically competent. I've only ever replaced the viscous coupling on mine, which I did in-situ. However if you want to do a full rebuild you will have to remove it from the car which will probably be the most difficult bit.
The parts to rebuild it are all available, ( for example http://www.ashcroft-transmissions.co.uk/part_88.html )and once it's out of the car shouldn't be particularly tricky if you are mechanically competent. I've only ever replaced the viscous coupling on mine, which I did in-situ. However if you want to do a full rebuild you will have to remove it from the car which will probably be the most difficult bit.