A number of people have asked for the following information.
Peter Burgess who follows this website has his own business in engine performance tuning. He specialises in MGs etc (Leyland Series Engines) however his business includes a Rolling Road on which you can pay to have your performance measured.
I was sent this a long time ago but only came to look at again today, thanks to Simon for finding it.
I have put together an information sheet on the different Transfer Box and Differential ratios that are shipped as standard on Jimny's.