Nissan Cabstar is what I am using. It is almost identical track and is very strong. This diff is used in lots of Japanese vehicles. Nissan Terranos / Ford Maveric (same vehicle),Toyotas.
There is also a limited slip diff which is the one I want.
Ratios are not particularly high but maybe higher than standard commer. I can't remember the numbers off the top of my head.
Have a look in readers ride under 'Greanbean 1' for some pictures.
Rob
Greanbean = Rob Smith after forgetting his password...doh