Powetrax lock right issues

Just had this fitted to my 8.75 rear;
http://www.richmondgear.com/powertrax/lockright2.html

It clanks going round corners and as i straighten it gives off quite a bang. No probs going in a straight line. I'm new to LSDs (no jokes) so not sure what to expect.

Its pretty basic and having looked more closely at the Richmond gear website i might have selcted the race/strip version.

Wonder if you engineer types could check the link and give me an opinion?